small fixes

docs/_sidebar.md

@@ -7,5 +7,5 @@
     * [Dynamic Module Loader](reference/DynamicModuleLoader.md)
     * [Usage with Redux Saga](reference/ReduxSaga.md)
     * [Usage with Redux Observable](reference/ReduxObservable.md)
-    * [Extensions](reference/Extensions)
+    * [Extensions](reference/Extensions.md)
     * [Lifecycle Actions](reference/LifecyleActions.md)