[gtk+] Add gk_gl_context_is_legacy to the docs

[Matthias Clasen <matthiasc src gnome org>]

commit 09ea0c9110139045e6667df921e482cac13555a4
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Mar 20 22:47:22 2016 -0400

    Add gk_gl_context_is_legacy to the docs

 docs/reference/gdk/gdk3-sections.txt |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gdk/gdk3-sections.txt b/docs/reference/gdk/gdk3-sections.txt
index 268b497..48fcd3c 100644
--- a/docs/reference/gdk/gdk3-sections.txt
+++ b/docs/reference/gdk/gdk3-sections.txt
@@ -1344,6 +1344,7 @@ gdk_gl_context_set_debug_enabled
 gdk_gl_context_get_debug_enabled
 gdk_gl_context_set_forward_compatible
 gdk_gl_context_get_forward_compatible
+gdk_gl_context_is_legacy
 
 <SUBSECTION>
 GdkGLError