rubygems/rubygems — pull request #399 by mattwildig (2012-11-27 21:56:53+00:00)
Title: Remove reference to 'sources' gem in docs.

The 'sources' gem is no longer used (see commit
e72e92fc996b8590a5361b62159f3603f92152e0).

Delete reference to it in docs for Gem.sources.