Changes include:
- Existing phpdoc block improvements
- Inclusion of defaults for optional parameters
- Hash-notated argument arrays
- Removal of unnecessary or redundant tagging.
Also standardization of int|WP_Post function parameters.
These changes clear the way toward less redundancy for hook docs in a future ticket.
Still left: Fully documented arguments in `comment_form()` and a pass through Walker_Comment.
See #20495. See #25388.
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