Moderating Comments out of date

[mwentz]

The Moderating Comments documentation is out of date (since commit 19a22c647360ec53e49158a3e3266de376a72fa).

• The Managing Comments section is out of date since the Comments screen no longer has the Mark as Spam action.
• Enabling Spam Protection should include a note that the Spam Filter part needs to be added to the content type.
• There is no mention of the Spam admin page.