Sanitization documentation update #1

docs/sanitization.md

@@ -4,7 +4,7 @@ Sanitization Rules
 Gollum uses the [Sanitize](http://wonko.com/post/sanitize) gem for HTML
 sanitization.
-See `lib/gollum.rb` for actual settings.
+See `lib/gollum-lib/sanitization.rb` for actual settings.
 ## ALLOWED TAGS
@@ -28,5 +28,6 @@ valign, value, vspace, width
 ## ALLOWED PROTOCOLS
-a href: http, https, mailto
-img src: http, https
\ No newline at end of file
+a href: http, https, mailto, ftp, irc, apt
+img src: http, https
+form action: http, https