[gnome-builder] docs: Fix grammar

[Matthew Leeds <mwleeds src gnome org>]

commit a67a122afc97d3043c7a37642239e439be553873
Author: Matthew Leeds <mleeds redhat com>
Date:   Sun Jul 3 22:13:55 2016 -0400

    docs: Fix grammar

 libide/ide-context.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libide/ide-context.c b/libide/ide-context.c
index 4ed78d2..f279e57 100644
--- a/libide/ide-context.c
+++ b/libide/ide-context.c
@@ -140,7 +140,7 @@ ide_context_get_recent_manager (IdeContext *self)
  * Retrieves the global back forward list for the #IdeContext.
  *
  * Consumers of this should branch the #IdeBackForwardList and merge them
- * when there document stack is closed.
+ * when their document stack is closed.
  *
  * See ide_back_forward_list_branch() and ide_back_forward_list_merge() for
  * more information.