docs(store): $dispose doesn't delete store state (#1824)

Co-authored-by: Eduardo San Martin Morote <[email protected]>
Close #1821

Author: DevilTea

packages/pinia/src/types.ts

@@ -410,6 +410,9 @@ export interface _StoreWithState<
    * Stops the associated effect scope of the store and remove it from the store
    * registry. Plugins can override this method to cleanup any added effects.
    * e.g. devtools plugin stops displaying disposed stores from devtools.
+   * Note this doesn't delete the state of the store, you have to do it manually with
+   * `delete pinia.state.value[store.$id]` if you want to. If you don't and the
+   * store is used again, it will reuse the previous state.
    */
   $dispose(): void