Update Depth Test png to be a svg

Author: spencer-lunarg

chapters/depth.adoc

@@ -315,7 +315,7 @@ The depth test compares the framebuffer depth coordinate `Zf` with the depth val
 
 The following gives a high level overview of the depth test.
 
-image::{images}depth_test.png[depth_test]
+image::{images}depth_test.svg[depth_test]
 
 [[depth-compare-operation]]
 ==== Depth Compare Operation

chapters/images/depth_test.png

@@ -314,7 +314,7 @@ xref:{chapters}extensions/cleanup.adoc#vk_khr_depth_stencil_resolve[VK_KHR_depth
 
 以下に、深度テストの概要を説明します。
 
-image::../../../chapters/images/depth_test.png[depth_test]
+image::../../../chapters/images/depth_test.svg[depth_test]
 
 [[depth-compare-operation]]
 ==== 深度比較操作

chapters/images/depth_test.svg

@@ -315,7 +315,7 @@ Vulkan에서는 xref:{chapters}extensions/cleanup.adoc#vk_khr_depth_stencil_reso
 
 다음은 깊이 테스트에 대한 개괄적인 개요입니다.
 
-image::../../../chapters/images/depth_test.png[depth_test]
+image::../../../chapters/images/depth_test.svg[depth_test]
 
 [[depth-compare-operation]]
 ==== 깊이 비교 연산(Depth Compare Operation)