docs: update pretty-format references to @vitest/pretty-format

Co-authored-by: hi-ogawa <[email protected]>

Author: Copilot

docs/config/index.md

@@ -1660,7 +1660,7 @@ Will call [`vi.unstubAllGlobals`](/api/vi#vi-unstuballglobals) before each test.
 
 - **Type:** `PrettyFormatOptions`
 
-Format options for snapshot testing. These options are passed down to our fork of [`pretty-format`](https://www.npmjs.com/package/pretty-format). In addition to the `pretty-format` options we support `printShadowRoot: boolean`.
+Format options for snapshot testing. These options are passed down to our fork of [`@vitest/pretty-format`](https://www.npmjs.com/package/@vitest/pretty-format). In addition to the `@vitest/pretty-format` options we support `printShadowRoot: boolean`.
 
 ::: tip
 Beware that `plugins` field on this object will be ignored.

docs/guide/snapshot.md

@@ -192,7 +192,7 @@ Pretty foo: Object {
 }
 ```
 
-We are using Jest's `pretty-format` for serializing snapshots. You can read more about it here: [pretty-format](https://github.com/facebook/jest/blob/main/packages/pretty-format/README.md#serialize).
+We are using our fork of `pretty-format` for serializing snapshots. You can read more about it here: [@vitest/pretty-format](https://www.npmjs.com/package/@vitest/pretty-format).
 
 ## Difference from Jest
 
@@ -209,7 +209,7 @@ This does not really affect the functionality but might affect your commit diff
 
 #### 2. `printBasicPrototype` is default to `false`
 
-Both Jest and Vitest's snapshots are powered by [`pretty-format`](https://github.com/facebook/jest/blob/main/packages/pretty-format). In Vitest we set `printBasicPrototype` default to `false` to provide a cleaner snapshot output, while in Jest <29.0.0 it's `true` by default.
+Both Jest and Vitest's snapshots are powered by `pretty-format`. Vitest uses its own fork [`@vitest/pretty-format`](https://www.npmjs.com/package/@vitest/pretty-format). In Vitest we set `printBasicPrototype` default to `false` to provide a cleaner snapshot output, while in Jest <29.0.0 it's `true` by default.
 
 ```ts
 import { expect, test } from 'vitest'