Fix typo in media help text.

props tai.
fixes #29412.
Built from https://develop.svn.wordpress.org/trunk@29651


git-svn-id: http://core.svn.wordpress.org/trunk@29425 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Sync tagline from about page with credits and freedoms.

props rickalee.
fixes #29409.

Built from https://develop.svn.wordpress.org/trunk@29652


git-svn-id: http://core.svn.wordpress.org/trunk@29426 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Editor expand: add a filter to turn it off from PHP, fixes #29423
Built from https://develop.svn.wordpress.org/trunk@29653


git-svn-id: http://core.svn.wordpress.org/trunk@29427 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Editor expand: add docs for the `wp_editor_expand` filter, props DrewAPicture, fixes #29423
Built from https://develop.svn.wordpress.org/trunk@29654


git-svn-id: http://core.svn.wordpress.org/trunk@29428 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Merge pull request #5 from WordPress/master

Update