Link to useLayoutEffect gist in a warning (facebook#15158)

Author: gaearon

packages/react-dom/src/server/ReactPartialRendererHooks.js

@@ -389,7 +389,8 @@ export function useLayoutEffect(
       "be encoded into the server renderer's output format. This will lead " +
       'to a mismatch between the initial, non-hydrated UI and the intended ' +
       'UI. To avoid this, useLayoutEffect should only be used in ' +
-      'components that render exclusively on the client.',
+      'components that render exclusively on the client. ' +
+      'See https://fb.me/react-uselayouteffect-ssr for common fixes.',
   );
 }