[FIX] useSSR - remove redundant code

Remove redundant code from bottom of snippet, given that it also appears in its example (and relates more to the example/usage than the setup).

snippets/useSSR.md

@@ -38,12 +38,6 @@ const useSSR = (callback, delay) => {
 
   return React.useMemo(() => Object.assign(Object.values(useSSRObject), useSSRObject), [inBrowser]);
 };
-
-const SSRChecker = props => {
-  let { isBrowser, isServer } = useSSR();
-
-  return <p>{ isBrowser ? 'Running on browser' : 'Running on server' }</p>;
-};
 ```
 
 ```jsx