Update default-configuration.adoc

Add ping description

Author: mkjsix

docs/default-configuration.adoc

@@ -457,9 +457,18 @@ authTokenService:
   uri: /tokens
 
 # Simple ping service
+# Must respond with HTTP 200 OK
+# if enable-extended-response is true, returns the following JSON response
+# {
+#    "client_ip": "<caller ip>",
+#    "host": "<hostname>",
+#    "message": "Greetings from RESTHeart!",
+#    "version": "<RESTHeart version>"
+# }
 ping:
   enabled: true
   msg: Greetings from RESTHeart!
+  enable-extended-response: true
 
 # Returns the roles of the authenticated user
 roles:
@@ -678,4 +687,4 @@ connection-options:
   # even when it is not strictly required by the specification.
   # Defaults to true
   ALWAYS_SET_KEEP_ALIVE: true
-----
+----