[gtk: 1/2] Fix typos

[Matthias Clasen <matthiasc src gnome org>]

commit 0632e94e68f5ef71923953553b5e544e47c9621c
Author: Hodong Kim <hodong nimfsoft com>
Date:   Sun Nov 7 16:48:39 2021 +0900

    Fix typos

 docs/reference/gdk/macos.md   | 2 +-
 docs/reference/gdk/wayland.md | 2 +-
 docs/reference/gdk/x11.md     | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/docs/reference/gdk/macos.md b/docs/reference/gdk/macos.md
index 1a0429be9d..05d1fbbbbe 100644
--- a/docs/reference/gdk/macos.md
+++ b/docs/reference/gdk/macos.md
@@ -33,7 +33,7 @@ calls to different backends, and error out on unsupported windowing systems:
   else
 #endif
 #ifdef GDK_WINDOWING_WAYLAND
-  if (GTK_IS_WAYLAND_DISPLAY (display))
+  if (GDK_IS_WAYLAND_DISPLAY (display))
     {
       // make Wayland-specific calls here
     }
diff --git a/docs/reference/gdk/wayland.md b/docs/reference/gdk/wayland.md
index 040e96a4e9..470b7bbcf9 100644
--- a/docs/reference/gdk/wayland.md
+++ b/docs/reference/gdk/wayland.md
@@ -23,7 +23,7 @@ calls to different backends, and error out on unsupported windowing systems:
 #endif
 
 #ifdef GDK_WINDOWING_WAYLAND
-  if (GTK_IS_WAYLAND_DISPLAY (display))
+  if (GDK_IS_WAYLAND_DISPLAY (display))
     {
       // make Wayland-specific calls here
     }
diff --git a/docs/reference/gdk/x11.md b/docs/reference/gdk/x11.md
index 6602e24b82..ee4f173d8c 100644
--- a/docs/reference/gdk/x11.md
+++ b/docs/reference/gdk/x11.md
@@ -29,7 +29,7 @@ calls to different backends, and error out on unsupported windowing systems:
   else
 #endif
 #ifdef GDK_WINDOWING_WAYLAND
-  if (GTK_IS_WAYLAND_DISPLAY (display))
+  if (GDK_IS_WAYLAND_DISPLAY (display))
     {
       // make Wayland-specific calls here
     }