Clarify phpdoc for `get_comment_author_link()`.

props nofearinc. Fixes #24508.

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Upgrader: Fix the order of arguements passed to wp_parse_args() in the Upgrader, introduced with [25272]. See #22704

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WordPress Core Automatic Updates: Add a post-upgrade summary email to the WordPress install's admin email address. See #22704

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Some more tweaks for the documentation in wp-admin/includes/ms.php. see #25229.
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Clarify error handling and special cases in the `wp_insert_term()` phpdoc block.

props lgedeon, SergeyBiryukov. See #22801.

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Inline documentation for hooks in wp-admin/admin-header.php.

props ericlewis. Fixes #25353.

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