Fix comments in atheme.conf.example

Clean up copy-paste errors in RPGserv block.
Added some useful examples

Many people need to search for channels by searchterm and topic, so I though it'd be a good idea to add some useful examples. :)
chanserv/quiet: make place_quietmask() available as a public API
chanserv/antiflood: hook up the module
chanserv/antiflood: enhancements
chanserv/antiflood: bugfix
chanserv/antiflood: improve logic
chanserv/antiflood: remove the line timer, it seems stupid
chanserv/antiflood: do garbage collection on channel drop
chanserv/antiflood: put license text on this
chanserv/antiflood: use stringrefs and track sources
chanserv/antiflood: on second thought, only use stringrefs for sources
chanserv/antiflood: bring back line timing
chanserv/antiflood: relax user match flood
chanserv/antiflood: line timing enhancements
chanserv/antiflood: +q the mangled host, not the real one (avoid info leak)
chanserv/antiflood: do not enforce against users with CSTATUS flags
libathemecore: add chanban_t.flags
chanserv/antiflood: add unenforce for quiets
chanserv/antiflood: add antiflood_enforce_method_impl_get() stub