Merge pull request #99 from khaledhosny/introspection-fixes2

More ntrospection fixes
diff --git a/src/hb-buffer.cc b/src/hb-buffer.cc
index b9fe263..0543073 100644
--- a/src/hb-buffer.cc
+++ b/src/hb-buffer.cc
@@ -967,7 +967,7 @@
  *
  * 
  *
- * Return value: 
+ * Return value: (transfer none):
  *
  * Since: 1.0
  **/
@@ -999,7 +999,7 @@
 /**
  * hb_buffer_get_segment_properties:
  * @buffer: a buffer.
- * @props: 
+ * @props: (out):
  *
  * 
  *
diff --git a/src/hb-common.cc b/src/hb-common.cc
index c0233f3..ac10cf2 100644
--- a/src/hb-common.cc
+++ b/src/hb-common.cc
@@ -286,7 +286,7 @@
  *
  * 
  *
- * Return value: 
+ * Return value: (transfer none):
  *
  * Since: 1.0
  **/