Improved the help for supybot.directories.plugins.
Improved the help for supybot.directories.plugins.

raboof/supybot,frumiousbandersnatch/supybot-code,ProgVal/Limnoria-test,Ban3/Limnoria,mazaclub/mazabot-core,ProgVal/Limnoria-test,haxwithaxe/supybot,mazaclub/mazabot-core,jeffmahoney/supybot,Ban3/Limnoria,prashantpawar/supybot-rothbot,buildbot/supybot,kblin/supybot-gsoc