Release fixes: Minor caps, grammar, desc fixes

Incidentally, I believe the `check` method on `modules/exploits/unix/http/vmturbo_vmtadmin_exec_noauth.rb` is pretty broken, but not going to pull it or anything right now. It'll false positive on some versions, but doesn't look like it'll false negative on actually exploitable versions.

@wvu-r7 or @cdoughty-r7 please land this before release?