[gtk-doc] mkhtml2: fix warning message for glossentry issues

[Stefan Sauer <stefkost src gnome org>]

commit 81ad3d5fa8d57ce4f7122821cd05dd86ecb82b1a
Author: Stefan Sauer <ensonic users sf net>
Date:   Thu May 10 18:48:31 2018 +0200

    mkhtml2: fix warning message for glossentry issues

 gtkdoc/mkhtml2.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtkdoc/mkhtml2.py b/gtkdoc/mkhtml2.py
index b063fcf..9fc3ed1 100644
--- a/gtkdoc/mkhtml2.py
+++ b/gtkdoc/mkhtml2.py
@@ -324,7 +324,8 @@ def build_glossary(files):
                     debug.append('missing key')
                 if val_node is None:
                     debug.append('missing val')
-                logging.warning('Unexpected glossentry %s:', term.attrib['id'], ','.join(debug))
+                logging.warning('Broken glossentry "%s": %s',
+                                term.attrib['id'], ','.join(debug))
 
 
 # conversion helpers