fix: close unterminated code block in libs/ngrx-toolkit/README.md

Without this fix, the `## Redux Connector for the NgRx Signal Store `createReduxState()`` section is absorbed into the code block of the `## Storage Sync withStorageSync()` section.

Also this commit adds some closing `}` to the `withStorageSync` block.

libs/ngrx-toolkit/README.md

@@ -270,6 +270,9 @@ public class SyncedStoreComponent {
 
   clearStorage(): void {
     this.syncStore.clearStorage(); // clears the stored item in storage
+  }
+}
+```
 
 ## Redux Connector for the NgRx Signal Store `createReduxState()`