Fix percentage-closer soft shadow link

Overv · Overv · commit 087de5625416 · 2017-07-31T17:50:49.000+02:00
diff --git a/06_Texture_mapping/01_Image_view_and_sampler.md b/06_Texture_mapping/01_Image_view_and_sampler.md
@@ -256,7 +256,7 @@ samplerInfo.compareOp = VK_COMPARE_OP_ALWAYS;
 
 If a comparison function is enabled, then texels will first be compared to a
 value, and the result of that comparison is used in filtering operations. This
-is mainly used for [percentage-closer filtering](http://developer.nvidia.com/GPUGems/gpugems_ch11.html)
+is mainly used for [percentage-closer filtering](https://developer.nvidia.com/gpugems/GPUGems/gpugems_ch11.html)
 on shadow maps. We'll look at this in a future chapter.
 
 ```c++
