Fix URL's anchor to "Callback Refs" page (#3810)

* Fix URL's anchor to "Callback Refs" page

Replace "#the-ref-callback-attribute" with "#callback-refs"

* Update content/docs/reference-react-dom.md

Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com>

Co-authored-by: Alexey Pyltsyn <lex61rus@gmail.com>
Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com>

content/docs/reference-react-dom.md

@@ -50,7 +50,7 @@ If the optional callback is provided, it will be executed after the component is
 >
 > `ReactDOM.render()` currently returns a reference to the root `ReactComponent` instance. However, using this return value is legacy
 > and should be avoided because future versions of React may render components asynchronously in some cases. If you need a reference to the root `ReactComponent` instance, the preferred solution is to attach a
-> [callback ref](/docs/more-about-refs.html#the-ref-callback-attribute) to the root element.
+> [callback ref](/docs/refs-and-the-dom.html#callback-refs) to the root element.
 >
 > Using `ReactDOM.render()` to hydrate a server-rendered container is deprecated and will be removed in React 17. Use [`hydrate()`](#hydrate) instead.