[release][docs] Move SVE release notes to AArch64 section.

Author: Francesco Petrogalli

llvm/docs/ReleaseNotes.rst

@@ -103,26 +103,6 @@ Changes to the AArch64 Backend
 * Clearly error out on unsupported relocations when targeting COFF, instead
   of silently accepting some (without being able to do what was requested).
 
-Changes to the ARM Backend
---------------------------
-
-During this release ...
-
-* Implemented C-language intrinsics for the full Arm v8.1-M MVE instruction
-  set. ``<arm_mve.h>`` now supports the complete API defined in the Arm C
-  Language Extensions.
-
-* Added support for assembly for the optional Custom Datapath Extension (CDE)
-  for Arm M-profile targets.
-
-* Implemented C-language intrinsics ``<arm_cde.h>`` for the CDE instruction set.
-
-* Clang now defaults to ``-fomit-frame-pointer`` when targeting non-Android
-  Linux for arm and thumb when optimizations are enabled. Users that were
-  previously not specifying a value and relying on the implicit compiler
-  default may wish to specify ``-fno-omit-frame-pointer`` to get the old
-  behavior. This improves compatibility with GCC.
-
 * Clang adds support for the following macros that enable the
   C-intrinsics from the `Arm C language extensions for SVE
   <https://developer.arm.com/documentation/100987/>`_ (version
@@ -177,6 +157,26 @@ During this release ...
   provided through shared libraries, avoid using lazy binding. If you
   use lazy binding, the results could be corrupted.
 
+Changes to the ARM Backend
+--------------------------
+
+During this release ...
+
+* Implemented C-language intrinsics for the full Arm v8.1-M MVE instruction
+  set. ``<arm_mve.h>`` now supports the complete API defined in the Arm C
+  Language Extensions.
+
+* Added support for assembly for the optional Custom Datapath Extension (CDE)
+  for Arm M-profile targets.
+
+* Implemented C-language intrinsics ``<arm_cde.h>`` for the CDE instruction set.
+
+* Clang now defaults to ``-fomit-frame-pointer`` when targeting non-Android
+  Linux for arm and thumb when optimizations are enabled. Users that were
+  previously not specifying a value and relying on the implicit compiler
+  default may wish to specify ``-fno-omit-frame-pointer`` to get the old
+  behavior. This improves compatibility with GCC.
+
 Changes to the MIPS Target
 --------------------------