Update operations.md

Author: Nightbr

core/operations.md

@@ -344,7 +344,9 @@ Note that the operation name, here `api_questions_answer_get_subresource`, is th
 It'll be automatically set to `$resources_$subresource(s)_get_subresource`. To find the correct operation name you
 may use `bin/console debug:router`.
 
-Add to that, you can control depth of subresources with the parameter `maxDepth`. For example, if `Answer` entity also have subresource such as `comments`, you would like to not generate the route `api/questions/{id}/answers/{id}/comments`. You can do this by adding the parameter maxDepth in ApiSubresource annotation or yml/xml file configuration.
+### Control the depth of subresources
+
+You can control depth of subresources with the parameter `maxDepth`. For example, if `Answer` entity also have subresource such as `comments`and you don't want the route `api/questions/{id}/answers/{id}/comments` to be generated. You can do this by adding the parameter maxDepth in ApiSubresource annotation or yml/xml file configuration.
 
 ```php
 <?php