fix cross service comment

Author: timabilov

README.md

@@ -289,7 +289,7 @@ fetch_user({'name': 'Sam Jones'})
 # In any of your services
 
 # Given that your key_prefix is same everywhere,
-# it will invalidate all function calls where in your platform where it returned user with ID of 1.
+# it will invalidate all function calls in your platform where it returned user with ID of 1.
 # see @cache.invalidates for more
 cache.invalidate("user", 1)