Update jest.clearAllMocks() description

Update the description of `jest.clearAllMocks()` to the one from:
https://facebook.github.io/jest/docs/en/jest-object.html#jestclearallmocks

This also removes the `@deprecated` annotation which seems to have been invalid: The docs don't mention that this method is deprecated.

types/jest/index.d.ts

@@ -56,7 +56,8 @@ declare namespace jest {
      */
     function autoMockOn(): typeof jest;
     /**
-     * @deprecated use resetAllMocks instead
+     * Clears the mock.calls and mock.instances properties of all mocks.
+     * Equivalent to calling .mockClear() on every mocked function.
      */
     function clearAllMocks(): typeof jest;
     /**