commands.py: Explain the odd userHostmask check in getOtherUser
commands.py: Explain the odd userHostmask check in getOtherUser

Signed-off-by: James Vega <91ae71a1168cea0b65ac9975da69d5a7753116be@users.sourceforge.net>

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