Training wheels for the code in this file

Since you wrote an advice to cleanup commit messages I though you
might also appreciate similar cleanup applied to the code used to
do so :-)
Fix strings
Automatically activate advice

This advice is targeted at newbies I suppose.  Therefor it makes sense
to make it as easy for them as possible not require them to actually
read the documentation.  I normally don't like such automatic
activation of advice or minor-modes but these is an exception.