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referring to #2066.

The fix that allowed resolver to have TSIG keys and other future checks
made the setting of action impossible. This will work once again when
we merge #2184, but for now, we need the fix.

* Note that TSIG key is DNS specific.
* Language fix.
* Returned an example to the resolver.

It otherwise complained during config add somewhere/acl, that there's no
value. The defaults differ from module to module.

Also, some reindentation and removal of tabs is added.

Including something like more formal grammar of them.

Instead of talking the same over and over again, we now link the common
ACL chapter.

Not complete. Split done at the end of the day, without too much logic
at which point.

also changed the category from bug to build (it was definitely not a bug).
okayed on jabber.