[gimp] libgimpconfig: fix introspection in gimpcolorconfig.c.

[Jehan <jehanp src gnome org>]

commit 4e99c2590240b73a3f0c6f09b3613f3461057764
Author: Jehan <jehan girinstud io>
Date:   Sat Jul 27 23:55:30 2019 +0200

    libgimpconfig: fix introspection in gimpcolorconfig.c.
    
    Several returned values had no documentation, and needed in particular
    (transfer) annotations.
    
    Fixes various warnings:
    > return value: Missing (transfer) annotation

 libgimpconfig/gimpcolorconfig.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/libgimpconfig/gimpcolorconfig.c b/libgimpconfig/gimpcolorconfig.c
index 8e89a6f31a..24139f0157 100644
--- a/libgimpconfig/gimpcolorconfig.c
+++ b/libgimpconfig/gimpcolorconfig.c
@@ -631,6 +631,8 @@ gimp_color_config_get_out_of_gamut_color (GimpColorConfig *config,
  * @config: a #GimpColorConfig
  * @error:  return location for a #GError
  *
+ * Return value: (transfer full): the default RGB color profile.
+ *
  * Since: 2.10
  **/
 GimpColorProfile *
@@ -673,6 +675,8 @@ gimp_color_config_get_rgb_color_profile (GimpColorConfig  *config,
  * @config: a #GimpColorConfig
  * @error:  return location for a #GError
  *
+ * Return value: (transfer full): the default grayscale color profile.
+ *
  * Since: 2.10
  **/
 GimpColorProfile *
@@ -715,6 +719,8 @@ gimp_color_config_get_gray_color_profile (GimpColorConfig  *config,
  * @config: a #GimpColorConfig
  * @error:  return location for a #GError
  *
+ * Return value: (transfer full): the default CMYK color profile.
+ *
  * Since: 2.10
  **/
 GimpColorProfile *
@@ -757,6 +763,8 @@ gimp_color_config_get_cmyk_color_profile (GimpColorConfig  *config,
  * @config: a #GimpColorConfig
  * @error:  return location for a #GError
  *
+ * Return value: (transfer full): the default display color profile.
+ *
  * Since: 2.10
  **/
 GimpColorProfile *
@@ -789,6 +797,9 @@ gimp_color_config_get_display_color_profile (GimpColorConfig  *config,
  * @config: a #GimpColorConfig
  * @error:  return location for a #GError
  *
+ * Return value: (transfer full): the default soft-proofing color
+ *                                profile.
+ *
  * Since: 2.10
  **/
 GimpColorProfile *