* doc/syntax/methods.rdoc (Method Names):  Added method names including
  operator methods.
* doc/syntax/methods.rdoc (Return Values):  Added note that assignment
  methods ignore return values.
* doc/syntax/precedence.rdoc:  Added document describing precedence.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38825 b2dd03c8-39d4-4d8f-98ff-823fe69b080e