Fix documentation warning
Fix documentation warning

It was generating documentation warning:

> OCClassMockObject.m:237:3: 
> '@interface' command should not be used in a comment attached to a non-interface declaration
erikdoe/ocmock,firebase/ocmock,erikdoe/ocmock,imhuntingwabbits/ocmock,Lightricks/ocmock,Lightricks/ocmock,erikdoe/ocmock,erikdoe/ocmock,Lightricks/ocmock,Lightricks/ocmock