* object.c: [DOC] Document first argument also takes string for:

  rb_mod_const_get, rb_mod_const_set, rb_mod_const_defined

  Also added note about NameError exception for invalid constant name


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43412 b2dd03c8-39d4-4d8f-98ff-823fe69b080e