[bp/r52387][FIX]Add tip for novice admins on extra ways elsewhere to protect from spam (Tip can be closed for experienced admins). And pref for general comments moderation added there next to akismet.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@52388 b456876b-0849-0410-b77d-98878d47e9d5