Update shaderblow.adoc

Fixed broken link.
Second attempt to get inage link to show image.

src/docs/asciidoc/sdk/plugin/shaderblow.adoc

@@ -146,7 +146,7 @@ I chose to clamp this value inside the frag shader code instead of using java co
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-a|image:sdk/plugin/CgFzhkq-MKk[youtube_cgfzhkq-mkk,width="",height="",link="https://youtu.be/CgFzhkq-MKk"]
+a|image:sdk/plugin/CgFzhkq-MKk.jpg[youtube_cgfzhkq-mkk,width="",height="",link="https://youtu.be/CgFzhkq-MKk"]
 a| 
 
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@@ -199,7 +199,7 @@ Features:
 
 Forum: link:https://hub.jmonkeyengine.org/t/lightblow-shader/16182[https://hub.jmonkeyengine.org/t/lightblow-shader/16182] +
 Software for NormalMaps? making: link:http://shadermap.com/shadermap_pro.php[http://shadermap.com/shadermap_pro.php] +
-Software for CubeMaps? editing: link:http://developer.amd.com/archive/gpu/cubemapgen/pages/default.aspx[http://developer.amd.com/archive/gpu/cubemapgen/pages/default.aspx] +
+Software for CubeMaps? editing: link:https://code.google.com/archive/p/cubemapgen/downloads[https://code.google.com/archive/p/cubemapgen/downloads] +
 Watch following videos:
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