[clang] [clang][CodeGen] Fix metadata when vectorization is disabled by pragma (PR #135163)

[Ryotaro Kasuga via cfe-commits]

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@@ -194,7 +194,7 @@ void for_test_scalable(int *List, int Length) {
   }
 }
 
-// Verify for loop is performing scalable vectorization
+// Verify for loop is NOT performing vectorization because the width is 1
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kasuga-fj wrote:

Fixed both code and docs. Thanks.

https://github.com/llvm/llvm-project/pull/135163