fix: kafka bridge schema

lib-ee/emqx_ee_bridge/i18n/emqx_ee_bridge_kafka.conf

@@ -219,7 +219,7 @@ emqx_ee_bridge_kafka {
     socket_nodelay {
         desc {
             en: "When set to 'true', TCP buffer sent as soon as possible. "
-                "Otherwise the OS kernel may buffer small TCP packets for a while (40ms by default)."
+                "Otherwise, the OS kernel may buffer small TCP packets for a while (40 ms by default)."
             zh: "设置 ‘true' 让系统内核立即发送。否则当需要发送当内容很少时，可能会有一定延迟（默认 40 毫秒）。"
         }
         label {
@@ -294,12 +294,12 @@ emqx_ee_bridge_kafka {
     max_batch_bytes {
         desc {
             en: "Maximum bytes to collect in a Kafka message batch. "
-                "Most of the Kafka brokers default to a limit of 1MB batch size. "
-                "EMQX's default value is less than 1MB in order to compensate "
+                "Most of the Kafka brokers default to a limit of 1 MB batch size. "
+                "EMQX's default value is less than 1 MB in order to compensate "
                 "Kafka message encoding overheads (especially when each individual message is very small). "
                 "When a single message is over the limit, it is still sent (as a single element batch)."
             zh: "最大消息批量字节数。"
-                "大多数 Kafka 环境的默认最低值是 1MB，EMQX 的默认值比 1MB 更小是因为需要"
+                "大多数 Kafka 环境的默认最低值是 1 MB，EMQX 的默认值比 1 MB 更小是因为需要"
                 "补偿 Kafka 消息编码索需要的额外字节（尤其是当每条消息都很小的情况下）。"
                 "当单个消息的大小超过该限制时，它仍然会被发送，（相当于该批量中只有单个消息）。"
         }

lib-ee/emqx_ee_bridge/src/emqx_ee_bridge_kafka.erl

@@ -245,8 +245,21 @@ desc("config") ->
     ?DESC("desc_config");
 desc(Method) when Method =:= "get"; Method =:= "put"; Method =:= "post" ->
     ["Configuration for Kafka using `", string:to_upper(Method), "` method."];
-desc(_) ->
-    undefined.
+desc(Name) ->
+    lists:member(Name, struct_names()) orelse throw({missing_desc, Name}),
+    ?DESC(Name).
+
+struct_names() ->
+    [
+        auth_gssapi_kerberos,
+        auth_username_password,
+        kafka_message,
+        producer_buffer,
+        producer_kafka_opts,
+        producer_mqtt_opts,
+        socket_opts,
+        producer_opts
+    ].
 
 %% -------------------------------------------------------------------------------------------------
 %% internal