simplify the PHP config example for compound rate limiters

Author: xabbuh

rate_limiter.rst

@@ -622,16 +622,10 @@ You can configure multiple rate limiters to work together:
                     ->policy('fixed_window')
                     ->limit(2)
                     ->interval('1 minute')
-                ;
-
-            $framework->rateLimiter()
                 ->limiter('two_per_minute')
                     ->policy('fixed_window')
                     ->limit(5)
                     ->interval('1 hour')
-                ;
-
-            $framework->rateLimiter()
                 ->limiter('contact_form')
                     ->policy('compound')
                     ->limiters(['two_per_minute', 'five_per_hour'])