Fix fragment identifier (#2619)

content/docs/reference-react-dom.md

@@ -36,7 +36,7 @@ React supports all popular browsers, including Internet Explorer 9 and above, al
 ReactDOM.render(element, container[, callback])
 ```
 
-Render a React element into the DOM in the supplied `container` and return a [reference](/docs/more-about-refs.html) to the component (or returns `null` for [stateless components](/docs/components-and-props.html#functional-and-class-components)).
+Render a React element into the DOM in the supplied `container` and return a [reference](/docs/more-about-refs.html) to the component (or returns `null` for [stateless components](/docs/components-and-props.html#function-and-class-components)).
 
 If the React element was previously rendered into `container`, this will perform an update on it and only mutate the DOM as necessary to reflect the latest React element.