[Typo] Update configuration.rst

Author: chadyred

configuration.rst

@@ -1088,7 +1088,7 @@ already existing ``.env`` files).
         # .env (or .env.local)
         APP_ENV=prod
 
-        # .env.prod (or .env.local.prod) - this will fallback on the loaders you defined
+        # .env.prod (or .env.prod.local) - this will fallback on the loaders you defined
         APP_ENV=
 
 .. _configuration-accessing-parameters: