update no-string-refs.md?

[nickzarate]

No-string-refs.md makes the distinction between valid and invalid use of refs:
Invalid:

var Hello = React.createClass({
  componentDidMount: function() {
    var component = this.refs.hello;
    // ...do something with component
  },
  render: function() {
    return <div ref="hello">Hello, world.</div>;
  }
});

Valid:

var Hello = React.createClass({
  componentDidMount: function() {
    var component = this.hello;
    // ...do something with component
  },
  render() {
    return <div ref={c => this.hello = c}>Hello, world.</div>;
  }
});

However, the valid method described produces another warning "react/jsx-no-bind". No-string-refs.md may need to be updated so as to illustrate how to properly use refs without either warning?

[nickzarate]

Sorry I did not see issue #330, so I am closing mine.