Link the new constant as default in documentation

Author: egypt

lib/msf/core/db_manager/exploit_attempt.rb

@@ -97,7 +97,7 @@ def report_exploit_success(opts)
   # @option opts [Mdm::Host] :host
   # @option opts [Mdm::Service] :service
   # @option opts [Integer] :port (nil)
-  # @option opts ["tcp","udp"] :proto (nil)
+  # @option opts ["tcp","udp"] :proto (Msf::DBManager::DEFAULT_SERVICE_PROTO) See `Mdm::Service::PROTOS`
   # @option opts [Mdm::Vuln] :vuln (nil)
   # @option opts [Time] :timestamp (nil)
   # @option opts [Mdm::Vuln] :timestamp (nil)