doc: usb: include group usbd_msg_api

Include group usbd_msg_api to reference its members.

Signed-off-by: Johann Fischer <[email protected]>

Author: jfischer-no

doc/connectivity/usb/device_next/api/usbd.rst

@@ -9,3 +9,5 @@ API reference
 *************
 
 .. doxygengroup:: usbd_api
+
+.. doxygengroup:: usbd_msg_api

include/zephyr/usb/usbd_msg.h

@@ -52,7 +52,9 @@ enum usbd_msg_type {
 	USBD_MSG_MAX_NUMBER,
 };
 
-
+/**
+ * @cond INTERNAL_HIDDEN
+ */
 static const char *const usbd_msg_type_list[] = {
 	"VBUS ready",
 	"VBUS removed",
@@ -67,6 +69,7 @@ static const char *const usbd_msg_type_list[] = {
 
 BUILD_ASSERT(ARRAY_SIZE(usbd_msg_type_list) == USBD_MSG_MAX_NUMBER,
 	     "Number of entries in usbd_msg_type_list is not equal to USBD_MSG_MAX_NUMBER");
+/** @endcond */
 
 /**
  * @brief USB device message