Update help content for Dashboard. props kpdesign. fixes #26632.
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TinyMCE: add dashicon for the "wp_page" button, see #24067.
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Add wp_install and wp_upgrade hooks to the respective functions.

props Denis-de-Bernardy.
fixes #25762.

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Autocomplete for the new site admin email. Better than trying to remember which email address you used.

fixes #25348.

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Inline documentation for hooks in wp-admin/includes/update-core.php.

Props JoshuaAbenazer, kpdesign.
Fixes #25998.

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Inline documentation for hooks in wp-admin/includes/export.php.

Props cmmarslender, kpdesign.
Fixes #26894.

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Inline documentation for hooks in wp-includes/class-http.php.

Props kraftbj for the initial patches. Props kpdesign, DrewAPicture.
Fixes #26049.

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