Insert both the text and tutorial in new policy pages and highlight is brightly in the editor.
Show only the suggested text in the policy postbox.
Props melchoyce, idea15, allendav, xkon, macbookandrew, azaozz.
Merges [43044], [43048], [43052], [43126], [43146], and [43148] to the 4.9 branch.
Fixes#43473.
Built from https://develop.svn.wordpress.org/branches/4.9@43149
git-svn-id: http://core.svn.wordpress.org/branches/4.9@42978 1a063a9b-81f0-0310-95a4-ce76da25c4cd