[glib] gslist: Document that g_slist_sort() is stable

[Philip Withnall <pwithnall src gnome org>]

commit 74cbd6c34f56634c3d9d25395e4bea322fc37d47
Author: Philip Withnall <withnall endlessm com>
Date:   Thu Nov 16 10:27:37 2017 +0000

    gslist: Document that g_slist_sort() is stable
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=508976

 glib/gslist.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/glib/gslist.c b/glib/gslist.c
index bc29b41..7a24fb6 100644
--- a/glib/gslist.c
+++ b/glib/gslist.c
@@ -1034,7 +1034,8 @@ g_slist_sort_real (GSList   *list,
  *     first element comes before the second, or a positive value if
  *     the first element comes after the second.
  *
- * Sorts a #GSList using the given comparison function.
+ * Sorts a #GSList using the given comparison function. The algorithm
+ * used is a stable sort.
  *
  * Returns: the start of the sorted #GSList
  */