doc: Fix the Doxygen section endings

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/src/logging.c b/src/logging.c
index f8ed4cb..8dfc31e 100644
--- a/src/logging.c
+++ b/src/logging.c
@@ -754,4 +754,4 @@
 	return 0;
 }
 
-/*! }@ */
+/*! @} */