doc: Fix the Doxygen section endings

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/include/osmocom/vty/command.h b/include/osmocom/vty/command.h
index 79d0aec..664c83c 100644
--- a/include/osmocom/vty/command.h
+++ b/include/osmocom/vty/command.h
@@ -366,5 +366,5 @@
 
 extern void *tall_vty_cmd_ctx;
 
-/*! }@ */
+/*! @} */
 #endif				/* _ZEBRA_COMMAND_H */