[gtk/akitouni/gdkvulkan-doc-typo] vulkancontext: fix typos in documentation

[Abderrahim Kitouni <akitouni src gnome org>]

commit e0833e492c66b8570cb0cf204c02d7ee234fcd2b
Author: Abderrahim Kitouni <akitouni gnome org>
Date:   Sat Nov 17 19:35:47 2018 +0100

    vulkancontext: fix typos in documentation

 gdk/gdkvulkancontext.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gdk/gdkvulkancontext.c b/gdk/gdkvulkancontext.c
index f93997c23e..3aebd5717d 100644
--- a/gdk/gdkvulkancontext.c
+++ b/gdk/gdkvulkancontext.c
@@ -711,7 +711,7 @@ gdk_vulkan_context_get_image (GdkVulkanContext *context,
  *
  * Gets the index of the image that is currently being drawn.
  *
- * This function can only be used between gdk_cairo_context_begin_frame() and
+ * This function can only be used between gdk_draw_context_begin_frame() and
  * gdk_draw_context_end_frame() calls.
  *
  * Returns: the index of the images that is being drawn
@@ -734,7 +734,7 @@ gdk_vulkan_context_get_draw_index (GdkVulkanContext *context)
  * Gets the Vulkan semaphore that protects access to the image that is
  * currently being drawn.
  *
- * This function can only be used between gdk_cairo_context_begin_frame() and
+ * This function can only be used between gdk_draw_context_begin_frame() and
  * gdk_draw_context_end_frame() calls.
  *
  * Returns: (transfer none): the VkSemaphore