Update doc/symfony-cache-configuration.rst

Co-authored-by: David Buchmann <[email protected]>

doc/symfony-cache-configuration.rst

@@ -360,7 +360,7 @@ You can enable keeping the custom header with the `keepTtlHeader` parameter::
 
     new CustomTtlListener('My-TTL-Header', keepTtlHeader: true);
 
-By default if the custom ttl header is not found it will fallback to s-maxage.
+By default if the custom ttl header is not present, the listener falls back to the s-maxage cache-control directive.
 To disable this behavior you can set the `fallbackToSmaxage` parameter to false::
 
     new CustomTtlListener('My-TTL-Header', keepTtlHeader: true, fallbackToSmaxage: false);