[gtk+] docs: Add gtk_print_job_set_source_fd

[Matthias Clasen <matthiasc src gnome org>]

commit 6734f354b4687945d3a9e6cf398d076103ae6601
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Nov 19 13:26:49 2016 -0500

    docs: Add gtk_print_job_set_source_fd

 docs/reference/gtk/gtk4-sections.txt |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gtk/gtk4-sections.txt b/docs/reference/gtk/gtk4-sections.txt
index fa147fa..d85a996 100644
--- a/docs/reference/gtk/gtk4-sections.txt
+++ b/docs/reference/gtk/gtk4-sections.txt
@@ -5942,6 +5942,7 @@ gtk_print_job_get_printer
 gtk_print_job_get_title
 gtk_print_job_get_status
 gtk_print_job_set_source_file
+gtk_print_job_set_source_fd
 gtk_print_job_get_surface
 gtk_print_job_send
 gtk_print_job_set_track_print_status