Fix description to match code in referencing-values-with-refs.md (#4097)

beta/src/pages/learn/referencing-values-with-refs.md

@@ -82,7 +82,7 @@ const [startTime, setStartTime] = useState(null);
 const [now, setNow] = useState(null);
 ```
 
-When the user presses "Start," you'll use [`setInterval`](https://developer.mozilla.org/docs/Web/API/setInterval) in order to update the time every 10 milliseconds:
+When the user presses "Start," you'll use [`setInterval`](https://developer.mozilla.org/docs/Web/API/setInterval) in order to update the time every 100 milliseconds:
 
 <Sandpack>
 
@@ -656,4 +656,4 @@ export default function Chat() {
 
 </Solution>
 
-</Challenges>
+</Challenges>