[gtk+] Document gtk_parse_args limitations

[Matthias Clasen <matthiasc src gnome org>]

commit dd322f715f0ac97155e0e443eaf7a73f8727a134
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jan 30 16:09:15 2016 -0500

    Document gtk_parse_args limitations
    
    Mention that some things won't work without a display
    connection.

 gtk/gtkmain.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkmain.c b/gtk/gtkmain.c
index 2437ddc..d3c3ba2 100644
--- a/gtk/gtkmain.c
+++ b/gtk/gtkmain.c
@@ -953,6 +953,10 @@ gtk_init_with_args (gint                 *argc,
  * There is no need to call this function explicitly if you are using
  * gtk_init(), or gtk_init_check().
  *
+ * Note that many aspects of GTK+ require a display connection to
+ * function, so this way of initializing GTK+ is really only useful
+ * for specialized use cases.
+ *
  * Returns: %TRUE if initialization succeeded, otherwise %FALSE
  */
 gboolean