[at-spi2-core] Adding documentation to atspi_collection_match_invalid

[Mike Gorse <mgorse src gnome org>]

commit b5ec50b1307f82de4a4189d23df3445d8bebbb4a
Author: Aline Bessa <alibezz gmail com>
Date:   Fri Aug 12 22:14:19 2011 -0300

    Adding documentation to atspi_collection_match_invalid

 atspi/atspi-constants.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/atspi/atspi-constants.h b/atspi/atspi-constants.h
index b217325..21c7e42 100644
--- a/atspi/atspi-constants.h
+++ b/atspi/atspi-constants.h
@@ -158,7 +158,8 @@ typedef enum {
 
 /**
  * AtspiCollectionMatchType:
- * @ATSPI_Collection_MATCH_INVALID: 
+ * @ATSPI_Collection_MATCH_INVALID: Indicates an error condition or 
+ * uninitialized value.
  * @ATSPI_Collection_MATCH_ALL: #TRUE if all of the criteria are met.
  * @ATSPI_Collection_MATCH_ANY: #TRUE if any of the criteria are met.
  * @ATSPI_Collection_MATCH_NONE: #TRUE if none of the criteria are met.