doxygen: split VTY configuration in multiple files
diff --git a/src/vty/command.c b/src/vty/command.c
index 890fb7d..ab1eaca 100644
--- a/src/vty/command.c
+++ b/src/vty/command.c
@@ -40,7 +40,7 @@
 
 #include <osmocom/core/talloc.h>
 
-/*! \addtogroup vty
+/*! \addtogroup command
  * @{
  */
 /*! \file command.c */