docs: fix comment

Co-authored-by: Michal Nowacki <[email protected]>

agent/fw_drupal_common.h

@@ -154,7 +154,7 @@ void nr_drupal_headers_add(zval* arg, bool is_drupal_7 TSRMLS_DC);
  * Purpose: Before an invoke_all style call, adds the hook to that hook states stacks
  *
  * Params  : 1. A zval holding a copy of the hook invoked, to be managed by the hook
- *              states stacks and freed by invoke_all_clean_hook_stacks() after the
+ *              states stacks and freed by nr_drupal_invoke_all_hook_stacks_pop() after the
  *              invoke_all call completes
  */
 void nr_drupal_invoke_all_hook_stacks_push(zval* hook_copy);