fixup! [AArch64][llvm] Add support for new vcvt* intrinsics

Add a mention of new intrinsics to clang/docs/ReleaseNotes.rst

Author: jthackray

clang/docs/ReleaseNotes.rst

@@ -509,6 +509,8 @@ X86 Support
 
 Arm and AArch64 Support
 ^^^^^^^^^^^^^^^^^^^^^^^
+- More intrinsics for the following AArch64 instructions:
+  FCVTZ[US], FCVTN[US], FCVTM[US], FCVTP[US], FCVTA[US]
 
 Android Support
 ^^^^^^^^^^^^^^^