[dev-v5][Docs] Improve FluentDataGrid docs

[MarvinKlein1508]

Pull Request

📖 Description

This PR improves the documentation for FluentDataGrid.

It introduces a new page, DataGridColumnTypes, which contains examples of all available column types: PropertyColumn, TemplateColumn, and SelectColumn. The page also provides guidance on when to use each column type.

Since this is fundamental knowledge for using the component effectively, I placed the page relatively high in the navigation.

Additionally, I removed the separate pages containing these demos, as they are now consolidated into a single page that also includes the relevant API documentation.

👩‍💻 Reviewer Notes

The folder of examples is still pretty large. Would it be a good idea to categorize the demos by Layout and Advanced as we do in the Overview page?

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have added Unit Tests for my new component
• I have modified an existing component
• I have validated the Unit Tests for an existing component

[Copilot]

Pull request overview

This PR consolidates FluentDataGrid column documentation by introducing a single “Column Types” page that explains when to use PropertyColumn, TemplateColumn, and SelectColumn, and removes older, separate demo pages in favor of the new consolidated content.

Changes:

• Reworked DataGridColumnTypes.md into a “Column Types” documentation page and moved column API docs onto that page.
• Updated the main FluentDataGrid docs to link to the new consolidated page and removed links/sections for the older template-column pages.
• Restructured DataGrid demo examples by removing the old “TemplateColumns2” demo and adding/adjusting examples under Examples/ColumnTypes/.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
examples/Tools/FluentUI.Demo.SampleData/People.cs	Attempts to make Email editable in the sample Person model (currently introduces a compile-breaking duplicate member).
examples/Demo/FluentUI.Demo.Client/Documentation/Components/DataGrid/Pages/DataGridTemplateColumnsPage.md	Removed (content consolidated into the new Column Types page).
examples/Demo/FluentUI.Demo.Client/Documentation/Components/DataGrid/Pages/DataGridTemplateColumns2Page.md	Removed (content consolidated into the new Column Types page).
examples/Demo/FluentUI.Demo.Client/Documentation/Components/DataGrid/Pages/DataGridColumnTypes.md	Converted into the new “Column Types” page with consolidated demos + API references.
examples/Demo/FluentUI.Demo.Client/Documentation/Components/DataGrid/FluentDataGrid.md	Updated navigation/links and removed column API sections that moved to the new page.
examples/Demo/FluentUI.Demo.Client/Documentation/Components/DataGrid/Examples/DataGridTemplateColumns2.razor	Removed (superseded by new column-type examples).
examples/Demo/FluentUI.Demo.Client/Documentation/Components/DataGrid/Examples/ColumnTypes/DataGridTemplateColumn.razor	Updated template-column example; now demonstrates an email input column.
examples/Demo/FluentUI.Demo.Client/Documentation/Components/DataGrid/Examples/ColumnTypes/DataGridSelectColumn.razor	New SelectColumn example showing both SelectedItems and manual selection management.
examples/Demo/FluentUI.Demo.Client/Documentation/Components/DataGrid/Examples/ColumnTypes/DataGridPropertyColumn.razor	New minimal PropertyColumn example.

Comments suppressed due to low confidence (2)

examples/Demo/FluentUI.Demo.Client/Documentation/Components/DataGrid/Examples/ColumnTypes/DataGridTemplateColumn.razor:9

• @bind-Value requires a settable value, but People.Person.Email is currently an init-only property (positional record). This will not compile after removing the duplicate Email property attempt in People.cs.

Use one-way binding here (or introduce an editable view-model) to keep the sample compiling.
examples/Demo/FluentUI.Demo.Client/Documentation/Components/DataGrid/Pages/DataGridColumnTypes.md:21

• The Docs-style admonition syntax elsewhere in this repo uses a space after > (e.g., > [!NOTE]). Without the space, this may not render as an admonition depending on the Markdown pipeline.

[vnbaaij]

The folder of examples is still pretty large. Would it be a good idea to categorize the demos by Layout and Advanced as we do in the Overview page?

Yes. Let's do that. Can be done in this PR I think.