Update README.md (#127)

Change resetAllMocks to clearAllMocks
Add clarity

README.md

@@ -166,14 +166,15 @@ Reset your `localStorage` data and mocks before each test to prevent leaking.
 
 ```js
 beforeEach(() => {
-  // values stored in tests will also be available in other tests unless you run
+  // to fully reset the state between tests, clear the storage
   localStorage.clear();
-  // or directly reset the storage
-  localStorage.__STORE__ = {};
-  // you could also reset all mocks, but this could impact your other mocks
-  jest.resetAllMocks();
-  // or individually reset a mock used
+  // and reset all mocks
+  jest.clearAllMocks();
+
+  // clearAllMocks will impact your other mocks too, so you can optionally reset individual mocks instead:
   localStorage.setItem.mockClear();
+  // you can also directly reset the storage (same as .clear above)
+  localStorage.__STORE__ = {};
 });
 
 test('should not impact the next test', () => {