Enable MD001: Fix heading level increments for accessibility

[Copilot]

MD001 was disabled, allowing 255 instances where heading levels skip increments (e.g., H1→H3). This breaks screen reader navigation and document structure.

@BillWagner

Fixes #2194

EDIT; Ack, wrong issue...
Fixes #29

Changes

• Fixed 255 heading level violations across 222 markdown files
• Enabled MD001 in .markdownlint-cli2.jsonc

Example

Before:

# How to: Display Dialog Boxes

### To display a dialog box

After:

# How to: Display Dialog Boxes

## To display a dialog box

All heading hierarchies now increment by single levels (H1→H2→H3), ensuring proper document structure for assistive technologies.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>MD001: Heading levels should only increment by one level at a time</issue_title>
<issue_description>Violations of this rule has accessibility-related concerns.

Click here to view a list of MD001 violations

##[error]dotnet-desktop-guide/winforms/advanced/com-interop-by-displaying-a-windows-form-shadow.md:30 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h3; Actual: h4]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-add-data-to-the-clipboard.md:31 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-align-drawn-text.md:15 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-arrange-mdi-child-forms.md:19 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-capture-user-input-from-a-printdialog-at-run-time.md:18 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-change-the-value-of-a-setting-between-application-sessions.md:12 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-change-the-value-of-an-existing-setting-at-design-time.md:12 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-choose-the-printers-attached-to-user-computer-in-windows-forms.md:18 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-complete-windows-forms-print-jobs.md:18 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-create-a-path-gradient.md:21 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-create-application-settings.md:19 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-create-graphics-objects-for-drawing.md:27 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h3; Actual: h4]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-create-graphics-objects-for-drawing.md:44 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h3; Actual: h4]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-create-graphics-objects-for-drawing.md:90 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h3; Actual: h4]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-create-graphics-objects-for-drawing.md:118 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h3; Actual: h4]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-create-graphics-objects-for-drawing.md:155 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h3; Actual: h4]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-create-standard-windows-forms-print-jobs.md:17 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-determine-the-active-mdi-child.md:22 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-draw-cardinal-splines.md:16 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-draw-text-at-a-specified-location.md:23 MD001/heading-increment/header-increment Heading levels should only increment by one level at a time [Expected: h2; Actual: h3]
##[error]dotnet-desktop-guide/winforms/advanced/how-to-draw-wrapped-text-in-a-rectangle.md:22 MD001/heading-increment/header-increment Heading levels should only...

</details>



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- Fixes dotnet/docs-desktop#29

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| [dotnet-desktop-guide/winforms/advanced/how-to-align-drawn-text.md](https://github.com/dotnet/docs-desktop/blob/dbc3a117d5ac492786460590bf4ddc2d862a593c/dotnet-desktop-guide/winforms/advanced/how-to-align-drawn-text.md) | [dotnet-desktop-guide/winforms/advanced/how-to-align-drawn-text](https://review.learn.microsoft.com/en-us/dotnet/desktop/winforms/advanced/how-to-align-drawn-text?branch=pr-en-us-2189) |
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| [dotnet-desktop-guide/winforms/advanced/how-to-create-graphics-objects-for-drawing.md](https://github.com/dotnet/docs-desktop/blob/dbc3a117d5ac492786460590bf4ddc2d862a593c/dotnet-desktop-guide/winforms/advanced/how-to-create-graphics-objects-for-drawing.md) | [dotnet-desktop-guide/winforms/advanced/how-to-create-graphics-objects-for-drawing](https://review.learn.microsoft.com/en-us/dotnet/desktop/winforms/advanced/how-to-create-graphics-objects-for-drawing?branch=pr-en-us-2189) |
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| [dotnet-desktop-guide/winforms/advanced/how-to-draw-text-at-a-specified-location.md](https://github.com/dotnet/docs-desktop/blob/dbc3a117d5ac492786460590bf4ddc2d862a593c/dotnet-desktop-guide/winforms/advanced/how-to-draw-text-at-a-specified-location.md) | [dotnet-desktop-guide/winforms/advanced/how-to-draw-text-at-a-specified-location](https://review.learn.microsoft.com/en-us/dotnet/desktop/winforms/advanced/how-to-draw-text-at-a-specified-location?branch=pr-en-us-2189) |
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[Copilot]

Pull request overview

This pull request fixes accessibility violations by correcting 255 instances where markdown heading levels skip increments (e.g., H1→H3 instead of H1→H2→H3), which breaks screen reader navigation. The fix ensures all heading hierarchies increment by single levels across 222 markdown files and enables the MD001 linting rule to prevent future violations.

Changes:

• Fixed heading level violations across 222 markdown files by converting H3 to H2 and H4 to H3 where appropriate
• Enabled MD001 rule in .markdownlint-cli2.jsonc with accessibility comment
• Ensured proper document structure for assistive technologies

Reviewed changes

Copilot reviewed 223 out of 223 changed files in this pull request and generated no comments.

File	Description
.markdownlint-cli2.jsonc	Enabled MD001 rule to enforce proper heading level increments
Multiple markdown files (222 total)	Corrected heading levels from H3→H2 or H4→H3 to maintain proper hierarchy

Testing

[BillWagner]

This LGTM @adegeo

Let's