Typo "React.createRef()" :) (#1105)

content/docs/accessibility.md

@@ -233,7 +233,7 @@ constructor(props) {
     super(props);
 
     this.state = { isOpen: false };
-    this.toggleContainer = createRef();
+    this.toggleContainer = React.createRef();
 
     this.onClickHandler = this.onClickHandler.bind(this);
     this.onClickOutsideHandler = this.onClickOutsideHandler.bind(this);