[#2022] Fixed comment

Author: fxdupont

src/bin/dhcp4/dhcp4_srv.h

@@ -580,7 +580,7 @@ class Dhcpv4Srv : public process::Daemon {
     ///
     /// Checks if mandatory option is really there, that forbidden option
     /// is not there, and that client-id or server-id appears only once.
-    /// Calls the second method with the requirement level from the
+    /// Calls the second method with the requirement level based on
     /// message type.
     ///
     /// @param query Pointer to the client's message.