doc: improve a word client side rendering (#39771)

The term client-side rendering is ambiguous and misleading.
Some people would assume the architecture where a blank page is returned from the server and HTML generation is totally done on the frontend.

So I changed the term to `client-side data fetching`, which is widely used throughout the rest of the document.

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [x] Make sure the linting passes by running `pnpm lint`
- [x] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)

docs/basic-features/pages.md

@@ -41,7 +41,7 @@ Importantly, Next.js lets you **choose** which pre-rendering form you'd like to
 
 We **recommend** using **Static Generation** over Server-side Rendering for performance reasons. Statically generated pages can be cached by CDN with no extra configuration to boost performance. However, in some cases, Server-side Rendering might be the only option.
 
-You can also use **Client-side Rendering** along with Static Generation or Server-side Rendering. That means some parts of a page can be rendered entirely by client side JavaScript. To learn more, take a look at the [Data Fetching](/docs/basic-features/data-fetching/client-side.md) documentation.
+You can also use **Client-side data fetching** along with Static Generation or Server-side Rendering. That means some parts of a page can be rendered entirely by client side JavaScript. To learn more, take a look at the [Data Fetching](/docs/basic-features/data-fetching/client-side.md) documentation.
 
 ## Static Generation (Recommended)
 
@@ -217,7 +217,7 @@ On the other hand, Static Generation is **not** a good idea if you cannot pre-re
 
 In cases like this, you can do one of the following:
 
-- Use Static Generation with **Client-side Rendering:** You can skip pre-rendering some parts of a page and then use client-side JavaScript to populate them. To learn more about this approach, check out the [Data Fetching documentation](/docs/basic-features/data-fetching/client-side.md).
+- Use Static Generation with **Client-side data fetching:** You can skip pre-rendering some parts of a page and then use client-side JavaScript to populate them. To learn more about this approach, check out the [Data Fetching documentation](/docs/basic-features/data-fetching/client-side.md).
 - Use **Server-Side Rendering:** Next.js pre-renders a page on each request. It will be slower because the page cannot be cached by a CDN, but the pre-rendered page will always be up-to-date. We'll talk about this approach below.
 
 ## Server-side Rendering

docs/faq.md

@@ -14,7 +14,7 @@ description: Get to know more about Next.js with the frequently asked questions.
   <summary>How do I fetch data in Next.js?</summary>
   Next.js provides a variety of methods depending on your use case. You can use:
   <ul>
-    <li> Client-side rendering: Fetch data with <a href="/docs/basic-features/data-fetching/client-side.md#client-side-data-fetching-with-useeffect">useEffect</a> or <a href="/docs/basic-features/data-fetching/client-side.md#client-side-data-fetching-with-swr">SWR</a> inside your React components</li>
+    <li> Client-side data fetching: Fetch data with <a href="/docs/basic-features/data-fetching/client-side.md#client-side-data-fetching-with-useeffect">useEffect</a> or <a href="/docs/basic-features/data-fetching/client-side.md#client-side-data-fetching-with-swr">SWR</a> inside your React components</li>
     <li> Server-side rendering with <a href="/docs/basic-features/data-fetching/get-server-side-props.md">getServerSideProps</a></li>
     <li> Static-site generation with <a href="/docs/basic-features/data-fetching/get-static-props.md">getStaticProps</a></li>
     <li> Incremental Static Regeneration by <a href="/docs/basic-features/data-fetching/incremental-static-regeneration.md">adding the `revalidate` prop to getStaticProps</a></li>