* lib/matrix.rb: Fix docs. Patched by Ben Woodall. [GH-726]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47710 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-09-25

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47711 b2dd03c8-39d4-4d8f-98ff-823fe69b080e