Fix broken React Router links in "Synchronizing with Effects" and useEffect reference (#8707)

* Fix broken React Router link in "Synchronizing with Effects"

* Fix broken React Router link in useEffect reference

Author: romach

src/content/learn/synchronizing-with-effects.md

@@ -733,7 +733,7 @@ Writing `fetch` calls inside Effects is a [popular way to fetch data](https://ww
 This list of downsides is not specific to React. It applies to fetching data on mount with any library. Like with routing, data fetching is not trivial to do well, so we recommend the following approaches:
 
 - **If you use a [framework](/learn/creating-a-react-app#full-stack-frameworks), use its built-in data fetching mechanism.** Modern React frameworks have integrated data fetching mechanisms that are efficient and don't suffer from the above pitfalls.
-- **Otherwise, consider using or building a client-side cache.** Popular open source solutions include [TanStack Query](https://tanstack.com/query/latest), [useSWR](https://swr.vercel.app/), and [React Router 6.4+.](https://beta.reactrouter.com/en/main/start/overview) You can build your own solution too, in which case you would use Effects under the hood, but add logic for deduplicating requests, caching responses, and avoiding network waterfalls (by preloading data or hoisting data requirements to routes).
+- **Otherwise, consider using or building a client-side cache.** Popular open source solutions include [TanStack Query](https://tanstack.com/query/latest), [useSWR](https://swr.vercel.app/), and [React Router](https://reactrouter.com/). You can build your own solution too, in which case you would use Effects under the hood, but add logic for deduplicating requests, caching responses, and avoiding network waterfalls (by preloading data or hoisting data requirements to routes).
 
 You can continue fetching data directly in Effects if neither of these approaches suit you.
 

src/content/reference/react/useEffect.md

@@ -1050,7 +1050,7 @@ Writing `fetch` calls inside Effects is a [popular way to fetch data](https://ww
 This list of downsides is not specific to React. It applies to fetching data on mount with any library. Like with routing, data fetching is not trivial to do well, so we recommend the following approaches:
 
 - **If you use a [framework](/learn/creating-a-react-app#full-stack-frameworks), use its built-in data fetching mechanism.** Modern React frameworks have integrated data fetching mechanisms that are efficient and don't suffer from the above pitfalls.
-- **Otherwise, consider using or building a client-side cache.** Popular open source solutions include [TanStack Query](https://tanstack.com/query/latest/), [useSWR](https://swr.vercel.app/), and [React Router 6.4+.](https://beta.reactrouter.com/en/main/start/overview) You can build your own solution too, in which case you would use Effects under the hood but also add logic for deduplicating requests, caching responses, and avoiding network waterfalls (by preloading data or hoisting data requirements to routes).
+- **Otherwise, consider using or building a client-side cache.** Popular open source solutions include [TanStack Query](https://tanstack.com/query/latest/), [useSWR](https://swr.vercel.app/), and [React Router](https://reactrouter.com/). You can build your own solution too, in which case you would use Effects under the hood but also add logic for deduplicating requests, caching responses, and avoiding network waterfalls (by preloading data or hoisting data requirements to routes).
 
 You can continue fetching data directly in Effects if neither of these approaches suit you.