Wrap note about creating new instance in Caution (#11960)

Author: jerelmiller

docs/source/performance/server-side-rendering.mdx

@@ -124,7 +124,11 @@ app.listen(basePort, () => console.log(
 
 So far, whenever this example server receives a request, it first initializes Apollo Client and then creates a React tree that's wrapped with the `ApolloProvider` and `StaticRouter` components. The contents of that tree depend on the request's path and the `StaticRouter`'s defined routes.
 
-> It's important to create an _entirely new instance_ of Apollo Client for each request. Otherwise, your response to a request might include sensitive cached query results from a _previous_ request.
+<Caution> 
+
+It's important to create an _entirely new instance_ of Apollo Client for each request. Otherwise, your response to a request might include sensitive cached query results from a _previous_ request.
+
+</Caution>
 
 ### Executing queries with `getDataFromTree`