WordPress Core Automatic Updates: Pass the Filesystem path as $context to request_filesystem_credentials(). See #22704

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Inline documentation for hooks in wp-includes/shortcodes.php.

props natejacobs.
see #25229.
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Inline documentation for hooks in wp-admin/ms-delete-site.php.

props NikV.
see #25229.
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Avoid a PHP warning in network admin if a constant corresponding to a drop-in is not defined. fixes #25301.
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