[gimp] app: update `gimp-xcf-save` procedure documentation.

[Jehan Pagès <jehanp src gnome org>]

commit 2edfde4f4083d17c8d1015aff69edd5b96058d5b
Author: Jehan <jehan girinstud io>
Date:   Sat Jul 11 16:10:37 2015 +0200

    app: update `gimp-xcf-save` procedure documentation.
    
    The "filename" parameter must be in UTF-8 and in URI format (for
    instance file://path for local files, and not just a path).
    Cf. `g_file_new_for_uri()` documentation:
    @uri: a UTF-8 string containing a URI

 app/xcf/xcf.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/app/xcf/xcf.c b/app/xcf/xcf.c
index 92176ca..e5946b9 100644
--- a/app/xcf/xcf.c
+++ b/app/xcf/xcf.c
@@ -153,9 +153,8 @@ xcf_init (Gimp *gimp)
                                                        "Filename",
                                                        "The name of the file "
                                                        "to save the image in, "
-                                                       "in the on-disk "
-                                                       "character set and "
-                                                       "encoding",
+                                                       "in URI format and "
+                                                       "UTF-8 encoding",
                                                        TRUE, FALSE, TRUE,
                                                        NULL,
                                                        GIMP_PARAM_READWRITE));