* object.c (rb_obj_equal): Fixed an rb_obj_equal documentation typo
  where "a" was used instead of "obj".
  Fixes GH-349. Patch by @adnandoric

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41775 b2dd03c8-39d4-4d8f-98ff-823fe69b080e