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Rollup merge of #134321 - dtolnay:docassocconst, r=fmease
Hide `= _` as associated constant value inside impl blocks
Closes #134320.
### Before:
<img src="https://github.com/user-attachments/assets/19d28811-45d2-4563-9726-f40c6af411c6" width="300"> <img src="https://github.com/user-attachments/assets/1ecf8764-97ce-47f0-87fa-3b174d2fc578" width="300">
### After:
<img src="https://github.com/user-attachments/assets/6408c4ca-b1c4-42e4-884b-248833a4865f" width="300"> <img src="https://github.com/user-attachments/assets/df2f6981-16f6-409f-8abb-73c0a4a71d6b" width="300">
r? `@fmease`
