[5019_rebase] New global parser classes documented.

src/bin/dhcp4/json_config_parser.cc

@@ -371,6 +371,9 @@ public:
     }
 };
 
+/// @brief Parser that takes care of global DHCPv6 parameters.
+///
+/// See @ref parse method for a list of supported parameters.
 class Dhcp4ConfigParser : public isc::data::SimpleParser {
 public:
 

src/bin/dhcp6/json_config_parser.cc

@@ -600,6 +600,9 @@ public:
     }
 };
 
+/// @brief Parser that takes care of global DHCPv6 parameters.
+///
+/// See @ref parse method for a list of supported parameters.
 class Dhcp6ConfigParser : public isc::data::SimpleParser {
 public: