Update the README-spirv-remap.txt

Update the "feedback" section with the new preferred feedback channel.

README-spirv-remap.txt

@@ -28,10 +28,9 @@ workload.
 
 
 FEEDBACK
---------------------------------------------------------------------------------
-Report defects, enhancements requests, code improvements, etc to:
-   [email protected]
-
+---------------------------------------------------------------------------------
+Report defects, enhancement requests, code improvements, etc by creating
+issues in the glslang repository at https://github.com/KhronosGroup/glslang
 
 COMMAND LINE USAGE:
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