Rollup of 7 pull requests

[matthiaskrgr]

Successful merges:

• Improved clarity of documentation for std::fs::create_dir_all #126548 (Improved clarity of documentation for std::fs::create_dir_all)
• Replace ASCII control chars with Unicode Control Pictures #127528 (Replace ASCII control chars with Unicode Control Pictures)
• Fix malformed suggestion for repeated maybe unsized bounds #127717 (Fix malformed suggestion for repeated maybe unsized bounds)
• Fix some #[cfg_attr(not(doc), repr(..))] #128046 (Fix some #[cfg_attr(not(doc), repr(..))])
• Mark missing_fragment_specifier as FutureReleaseErrorReportInDeps #128122 (Mark missing_fragment_specifier as FutureReleaseErrorReportInDeps)
• std: use duplicate thread local state in tests #128135 (std: use duplicate thread local state in tests)
• Remove Unnecessary .as_str() Conversions #128140 (Remove Unnecessary .as_str() Conversions)

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