Clean up some IRC lingo

Remove some stale entries, clean up the backlog entry

Part of #4779

Author: coke

doc/Language/glossary.rakudoc

@@ -420,17 +420,10 @@ channels:
 
 As Late As Possible
 
-=head2 X<autopun|Reference,autopun>
-
-A self-referencing pun, e.g. "Are you ignorant or apathetic?" - "I don't
-know, and I don't care."
-
 =head2 X<backlog|Reference,backlog>
 
 That part of a discussion on an L<IRC|#IRC> channel that you've missed. If it is
-not or no longer available in your IRC client, you can go to sites such as
-L<https://irclogs.raku.org> to see what has been logged
-for you.
+no longer available in your IRC client, you can check L<the logs|https://irclogs.raku.org>.
 
 =head2 X<Bot|Reference,Bot>
 
@@ -488,10 +481,6 @@ Looks Good To Me
 Less Than Awesome. Usually used in the context of an error message that
 is rather non-descriptive or unrelated to the actual error.
 
-=head2 X<NST|Reference,NST>
-
-No Such Thing
-
 =head2 X<Opt|Reference,Opt>
 
 Short for "optimization", usually in either the context of