docs: clarify caching of fetch based on comment (#68419)

This code snippet comment was misleading, needs to be updated for
Next.js 15 behavior.

Co-authored-by: Delba de Oliveira <32464864+delbaoliveira@users.noreply.github.com>

docs/02-app/01-building-your-application/02-data-fetching/02-caching-and-revalidating.mdx

@@ -10,12 +10,11 @@ Caching is the process of storing data to reduce the number of requests made to
 
 ### `fetch` requests
 
-Starting with Next.js 15, `fetch` requests are not cached by default.
+`fetch` requests are not cached by default in Next.js 15.
 
 To cache an individual `fetch` request, you can use the `cache: 'force-cache'` option:
 
 ```js
-// 'force-cache' is the default, and can be omitted
 fetch('https://...', { cache: 'force-cache' })
 ```