[clang] [HLSL] Document all spellable attributes (PR #213346)

[Justin Bogner via cfe-commits]

================
@@ -5333,7 +5333,7 @@ def HLSLVkLocation : HLSLAnnotationAttr {
 }
 
 // `row_major` / `column_major` are HLSL keywords that select the in-memory
-// layout of a matrix-typed declaration. 
+// layout of a matrix-typed declaration.
----------------
bogner wrote:

accidental whitespace clean up - best to revert it as to not muddy up the review.
```suggestion
// layout of a matrix-typed declaration. 
```

https://github.com/llvm/llvm-project/pull/213346