[clang] [NFC][Clang][Headers] Update refs to ACLE in comments (PR #66662)

[Volodymyr Turanskyy via cfe-commits]

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@@ -32,7 +32,7 @@ extern "C" {
 #define __isb(i) __builtin_arm_isb(i)
 #endif
 
-/* 8.4 Hints */
+/* 7.4 Hints */
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voltur01 wrote:

HTML version has the extra `.` https://arm-software.github.io/acle/main/acle.html#hints but the PDF one does not https://github.com/ARM-software/acle/releases/download/r2023Q2/acle-2023Q2.pdf - the solution, probably, depends on what is linked as suggested in a comment above: HTML or PDF version.

https://github.com/llvm/llvm-project/pull/66662