[clang] [llvm] [AArch64][docs] Add release notes for FUJITSU-MONAKA support (PR #120684)

[Kinoshita Kotaro via llvm-commits]

================
@@ -977,6 +977,10 @@ Arm and AArch64 Support
   in leaf functions after enabling ``-fno-omit-frame-pointer``, you can do so by adding
   the ``-momit-leaf-frame-pointer`` option.
 
+- Support has been added for the following processors (-mcpu identifiers in parenthesis):
----------------
kinoshita-fj wrote:

I've added in this commit 82164cd56dcd6a66a314124067c265d6293247ef.

https://github.com/llvm/llvm-project/pull/120684