Update test comments per review feedback

Author: anupamachandra

tools/clang/test/LitDXILValidation/outer-product-accumulate-matrix-layout-failing.ll

@@ -1,7 +1,9 @@
 ; REQUIRES: dxil-1-9
 ; RUN: not %dxv %s 2>&1 | FileCheck %s
 
-;Original Source: \tools\clang\test\CodeGenHLSL\linalg\outer-product-accumulate-matrix-layout.hlsl
+; Original Source: \tools\clang\test\CodeGenHLSL\linalg\outer-product-accumulate-matrix-layout.hlsl
+; The failing tests were generated by manually editing the IR produced from the IR from the passing
+; case generated by running the hlsl above (Original Source)
 
 target datalayout = "e-m:e-p:32:32-i1:32-i8:8-i16:16-i32:32-i64:64-f16:16-f32:32-f64:64-n8:16:32:64"
 target triple = "dxil-ms-dx"