dir.c: document base keyword argument of Dir.glob
base
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58885 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
dir.c: document base keyword argument of Dir.glob
base
keyword argument of Dir.glob[Feature #13056]; also improve docs for Dir.glob and Dir[].
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58885 b2dd03c8-39d4-4d8f-98ff-823fe69b080e