Fixes for inline documentation for hooks in wp-comments-post.php.

Adds missing `@since` versions, spacing, and language tweaks.

See #26869, #25229, [25249].

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Fixes for hooks documentation in wp-admin/admin-footer.php.

Adds some new lines, some hook-line spacing, docs-specific variables, and other language tweaks.

See #26869, #25229, [25252].

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Fixes for hooks documentation on xmlrpc.php.

Adds spacing, changes an `@see` to `@link`, adds a docs-specific variable for a parameter.

See #26869, #25229 and [25281].

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Fixes for hooks documentation in wp-includes/wp-db.php.

See #26869, #25229 and [25284].

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Improve inline documenation for `get_the_time()` and `get_post_time().

Props ruud@joyo for the initial patch.
Fixes #26682.

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Improve inline documentation for `wp_new_user_notification()`.

Props antorome for the initial patch.
Fixes #26703.

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Nav Menu: Remove post/page items from the Nav Menu when the post/page is deleted.

This was broken through a change in [25163]. `_menu_item_object` in wp_get_associated_nav_menu_items() is not relevant for post types.
Adds unit tests.

props UmeshSingla for initial patch.
fixes #26795.
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Update comment about structure of items in $menu global.

props kitchin.
fixes #26635.
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Collect the post and link ids that will be reassigned before running the update in `remove_user_from_blog()`. Use `array_walk()` instead of `array_map()` when invalidating the caches for the collected ids.

Props kovshenin.
Fixes #25545.


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Run wp_auth_check on every heartbeat tick.

wp_heartbeat_received only runs when data is sent. We want to always pass this data back, though.

fixes #27081.

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Remove unused arg from wp_auth_check(), see #27081.
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