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

[David Spickett via cfe-commits]

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@@ -20,8 +20,8 @@
 extern "C" {
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DavidSpickett wrote:

You may want to note that section numbers were correct at time of writing, if they've changed then look for the section title.

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