chore: fix typo in examples (#11788)

Author: k1499

examples/snapshot/Clock.react.js

@@ -15,7 +15,7 @@ const Clock = () => {
     return () => clearInterval(timerID);
   }, []);
 
-  return <p>{seconds} seconds have ellapsed since the UNIX epoch.</p>;
+  return <p>{seconds} seconds have elapsed since the UNIX epoch.</p>;
 };
 
 export default Clock;

examples/snapshot/__tests__/__snapshots__/clock.react.test.js.snap

@@ -3,6 +3,6 @@
 exports[`renders correctly 1`] = `
 <p>
   1482363367.071
-   seconds have ellapsed since the UNIX epoch.
+   seconds have elapsed since the UNIX epoch.
 </p>
 `;