docs(queryClient): JSDoc hint for queryClient.getQueryData (#8862)

* docs(queryClient): JSDoc hint for queryClient.getQueryData

follow up from: https://bsky.app/profile/tylur.dev/post/3llennpm4kk2z

* Update packages/query-core/src/queryClient.ts

* Update packages/query-core/src/queryClient.ts

---------

Co-authored-by: Dominik Dorfmeister <office@dorfmeister.cc>

Author: tylersayshi

Diff for: packages/query-core/src/queryClient.ts

@@ -119,6 +119,13 @@ export class QueryClient {
     return this.#mutationCache.findAll({ ...filters, status: 'pending' }).length
   }
 
+  /**
+   * Imperative (non-reactive) way to retrieve data for a QueryKey.
+   * Should only be used in callbacks or functions where reading the latest data is necessary, e.g. for optimistic updates. 
+   *
+   * Hint: Do not use this function inside a component, because it won't receive updates.
+   * Use `useQuery` to create a `QueryObserver` that subscribes to changes.
+   */
   getQueryData<
     TQueryFnData = unknown,
     TTaggedQueryKey extends QueryKey = QueryKey,