Add clarifying comment

AAP-20998
No-Issue

Author: bmclaughlin

galaxy_ng/app/dynaconf_hooks.py

@@ -581,6 +581,7 @@ def configure_legacy_roles(settings: Dynaconf) -> Dict[str, Any]:
 
 
 def configure_aap_proxy(settings: Dynaconf) -> Dict[str, Any]:
+    # The following variable is either a URL or a key file path.
     ANSIBLE_BASE_JWT_KEY = settings.get("ANSIBLE_BASE_JWT_KEY")
     if ANSIBLE_BASE_JWT_KEY:
         data = {