Try to clarify "number of elements in info.json does not match" error (#14844)

lib/python/qmk/info.py

@@ -691,8 +691,8 @@ def merge_info_jsons(keyboard, info_data):
 
             if layout_name in info_data['layouts']:
                 if len(info_data['layouts'][layout_name]['layout']) != len(layout['layout']):
-                    msg = '%s: %s: Number of elements in info.json does not match! info.json:%s != %s:%s'
-                    _log_error(info_data, msg % (info_data['keyboard_folder'], layout_name, len(layout['layout']), layout_name, len(info_data['layouts'][layout_name]['layout'])))
+                    msg = 'Number of keys for %s does not match! info.json specifies %d keys, C macro specifies %d'
+                    _log_error(info_data, msg % (layout_name, len(layout['layout']), len(info_data['layouts'][layout_name]['layout'])))
                 else:
                     for new_key, existing_key in zip(layout['layout'], info_data['layouts'][layout_name]['layout']):
                         existing_key.update(new_key)