[macros] Fix doc bug in transmute_mut!

[joshlf]

When we updated transmute_mut! to support unsized types, we forgot to
update one location in the documentation to reflect this.

---

• 　  Support unsized try_transmute_{ref,mut}! #2944
• 　  Support sized-to-unsized transmute_{ref,mut}! #2943
• 　  [layout] Support sized->unsized, sized->sized casts #2950
• 👉 [macros] Fix doc bug in transmute_mut! #2951

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[gemini-code-assist]

Summary of Changes

Hello @joshlf, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a documentation discrepancy for the transmute_mut! macro. Following a previous update that enabled the macro to handle unsized types, a specific part of its documentation was overlooked. This change rectifies that by adding the ?Sized trait bound to the relevant type parameters in the macro's doc comments, ensuring the documentation accurately describes the macro's functionality.

Highlights

• Documentation Update: The documentation for the transmute_mut! macro has been updated to correctly reflect its support for unsized types.
• Type Parameter Constraints: The Src and Dst type parameters in the transmute_mut! macro's documentation now include the ?Sized trait bound, aligning with the macro's actual capabilities.

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[gemini-code-assist]

Code Review

This is a good change that fixes a documentation bug in transmute_mut!. The documentation is now correctly updated to reflect support for unsized types, which aligns with the macro's capabilities. The change is correct and well-scoped.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.29%. Comparing base (34f572d) to head (7af1cb4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2951   +/-   ##
=======================================
  Coverage   92.29%   92.29%           
=======================================
  Files          19       19           
  Lines        5868     5868           
=======================================
  Hits         5416     5416           
  Misses        452      452           

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