[clang] [clang] document that by default FP turned off for ARM baremetal (PR #122881)

[David Spickett via cfe-commits]

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@@ -1071,6 +1071,10 @@ Arm and AArch64 Support
 - Implementation of SVE2.1 and SME2.1 in accordance with the Arm C Language
   Extensions (ACLE) is now available.
 
+- For ARM baremetal targets, the frame pointer (FP) is now turned off by
+  default. To turn on frame pointers for Arm baremetal targets, use
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DavidSpickett wrote:

Arm -> ARM

https://github.com/llvm/llvm-project/pull/122881