Docs: Fix broken links to Queries and Mutations (#234)

Author: Anthony Campolo

docs/concepts/mutations.md

@@ -32,7 +32,7 @@ const api = createApi({
 ```
 
 :::info
-Notice the `onStart`, `onSuccess`, `onError` methods? Be sure to check out how they can be used for [optimistic updates](./optimistic-updates)
+Notice the `onStart`, `onSuccess`, `onError` methods? Be sure to check out how they can be used for [optimistic updates](./optimistic-updates.md)
 :::
 
 ### Type interfaces

docs/concepts/queries.md

@@ -7,7 +7,7 @@ hide_title: true
 
 # Queries
 
-This is the most basic feature of RTK Query. A query operation can be performed with any data fetching library of your choice, but the general recommendation is that you only use queries for requests that retrieve data. For anything that alters data on the server or will possibly invalidate the cache, you should use a [Mutation](./mutations).
+This is the most basic feature of RTK Query. A query operation can be performed with any data fetching library of your choice, but the general recommendation is that you only use queries for requests that retrieve data. For anything that alters data on the server or will possibly invalidate the cache, you should use a [Mutation](./mutations.md).
 
 By default, RTK Query ships with [`fetchBaseQuery`](../api/fetchBaseQuery), which is a lightweight [`fetch`](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) wrapper that automatically handles request headers and response parsing in a manner similar to common libraries like `axios`.
 

docs/examples/examples-overview.md

@@ -7,7 +7,7 @@ hide_title: true
 
 # `About the examples`
 
-Currently, there are [several examples](https://github.com/rtk-incubator/rtk-query/tree/main/examples) that exist in the repo that you're able to run locally. These are not meant to be what you base your application on, but exist to show _very specific_ behaviors that you may not actually want or need in your application. For most users, the basic examples in the [Queries](../concepts/queries) and [Mutations](../concepts/mutations) sections will cover the majority of your needs.
+Currently, there are [several examples](https://github.com/rtk-incubator/rtk-query/tree/main/examples) that exist in the repo that you're able to run locally. These are not meant to be what you base your application on, but exist to show _very specific_ behaviors that you may not actually want or need in your application. For most users, the basic examples in the [Queries](../concepts/queries.md) and [Mutations](../concepts/mutations.md) sections will cover the majority of your needs.
 
 As a part of the CI setup, the examples are automatically built and deployed via the magic and goodwill of CodeSandbox CI. If you're interested, you can always [see the latest builds for every PR](https://ci.codesandbox.io/status/rtk-incubator/rtk-query) at any time.