Update 02_Development_environment.adoc

Linux installation instructions referred to the VulkanSDK Linux tarball as a .tgz, but on the lunarg website it is provided as a tar.xz.
Changed the command to reflect that.

Author: ricardosetton

en/02_Development_environment.adoc

@@ -317,7 +317,7 @@ link to the latest on like so:
 [,shell]
 ----
 pushd vulkansdk
-tar -xzf vulkansdk-linux-x86_64-1.4.304.1.tgz
+tar -xf vulkansdk-linux-x86_64-1.4.304.1.tar.xz
 ln -s 1.4.304.1 default
 ----