doc: Fix the Doxygen section endings

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/src/utils.c b/src/utils.c
index 0a970ac..cf0c934 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -212,4 +212,4 @@
 }
 #endif /* HAVE_CTYPE_H */
 
-/*! }@ */
+/*! @} */