[DRE-maint] Bug#443135: rubygems: Typo in gem binary

[Matthew Palmer]

FYI, I can't find any instance of the string 'instaling' in either the
rubygems or libgems-ruby1.8 package, version 1.0.1-4.  I strongly suspect
it's already been fixed.

Incidentally, Lucas, it would have been handy to know how/where you reported
this upstream, so I could have gone straight to the upstream bug report to
verify the fix.

- Matt