[clang] [Clang] Add AArch64 SME changes to the release notes (PR #122899)

[Maciej Gabka via cfe-commits]

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@@ -1076,6 +1076,15 @@ 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.
 
+- SME keyword attributes which apply to function types are now represented in the
+  mangling of the type.  This means that ``void foo(void (*f)() __arm_streaming);``
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mgabka wrote:

it looks like there is a double white space after "type."

https://github.com/llvm/llvm-project/pull/122899