doc: Fix the Doxygen section endings

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/src/vty/vty.c b/src/vty/vty.c
index da03596..04df2be 100644
--- a/src/vty/vty.c
+++ b/src/vty/vty.c
@@ -1768,4 +1768,4 @@
 	return rc;
 }
 
-/*! }@ */
+/*! @} */