Update caching.mdx (#83149)

In the docs it says => ( The default caching behavior of fetch (e.g.,
when the cache option is not specified) is equal to setting the cache
option to no-store )

But when I code, I found that fetch default behaviour and setting the
cache option to no-store are different.

After building process ....

When changing routes. default is stored as cache. I see that because
there is no new network request when I change route. In setting the
cache option to no-store, it is making a new network request as soon as
i get back to the page.

so docs and real working one are mismatch.

I also provided how tested with pictures belows.
Please build... and check
Change routes...

<img width="545" height="371" alt="image"
src="https://github.com/user-attachments/assets/4931302f-b5ef-4016-b43d-cbbd790c1e11"
/>

<img width="601" height="409" alt="image"
src="https://github.com/user-attachments/assets/3f2b4a79-fa24-466f-8330-0dc8323b6c16"
/>

Fixes #83146

---------

Co-authored-by: Joseph <joseph.chamochumbi@vercel.com>

Author: kaungMinn

docs/01-app/02-guides/caching.mdx

@@ -421,11 +421,10 @@ See the [`useRouter` hook](/docs/app/api-reference/functions/use-router) API ref
 
 Data returned from `fetch` is _not_ automatically cached in the Data Cache.
 
-The default caching behavior of `fetch` (e.g., when the `cache` option is not specified) is equal to setting the `cache` option to `no-store`:
+By default, when no `cache` or `next.revalidate` options are provided:
 
-```js
-let data = await fetch('https://api.vercel.app/blog', { cache: 'no-store' })
-```
+- [Dynamic rendering](/docs/app/getting-started/partial-prerendering#dynamic-rendering): Fetch runs on every request and always returns fresh data.
+- [Static rendering](/docs/app/getting-started/partial-prerendering#static-rendering): Fetched data is stored in the [Data Cache](#data-cache), and the rendered output in the [Full Route Cache](#full-route-cache). Next.js serves this cached result until the path is revalidated.
 
 See the [`fetch` API Reference](/docs/app/api-reference/functions/fetch) for more options.