Apply suggestions from code review

Author: TkDodo

docs/src/pages/guides/migrating-to-react-query-4.md

@@ -132,11 +132,11 @@ If you were importing anything from `'react-query/react'` directly in your proje
 + import { QueryClientProvider } from 'react-query/reactjs';
 ```
 
-### `persistQueryClient` and its sister plugins are no longer expermental and have been renamed
+### `persistQueryClient` and the corresponding persister plugins are no longer experimental and have been renamed
 
 The plugins `createWebStoragePersistor` and `createAsyncStoragePersistor` have been renamed to [`createWebStoragePersister`](/plugins/createWebStoragePersister) and [`createAsyncStoragePersister`](/plugins/createAsyncStoragePersister) respectively. The interface `Persistor` in `persistQueryClient` has also been renamed to `Persister`. Checkout [this stackexchange](https://english.stackexchange.com/questions/206893/persister-or-persistor) for the motivation of this change.
 
-Since these plugins are no longer experimental, there import paths have also been updated:
+Since these plugins are no longer experimental, their import paths have also been updated:
 
 ```diff
 - import { persistQueryClient } from 'react-query/persistQueryClient-experimental'