Release highlights

The documents modified in this release are:

List of changes

Changed the definition of the __ARM_ACLE macro to reflect the current versioning scheme.
Added __ARM_ACLE_VERSION to express a given ACLE version.
Combined the SME slice_base and slice_offset arguments into a single slice argument.
Added the Keyword attributes section.
Changed the SME language extensions to use keyword attributes instead of GNU-style attributes.
Added description of SVE reinterpret intrinsics.
Changes and fixes for Function Multi Versioning:
- Changed the mangling rules, such that feature names are appended in lexicographic order, not in priority order.
- Mangled names contain a unique set of features (no duplicates).
- Added MOPS.
- Changed name mangling of the default version.
- Aligned priorities to account for feature dependencies.
- Introduced alternative names (aliases) rdma for rdm.
- Corrected FEAT_BTI feature register value.
Introduced the __ARM_FEATURE_PAUTH_LR feature macro in section Pointer Authentication to indicate target support for the Armv9.5-A PAC Enhancements.
Introduced a new value to the __ARM_FEATURE_PAC_DEFAULT macro to indicate the use of PC as a diversifier for Pointer Authentication.
Added a State management section, replacing the __arm_shared_za, __arm_new_za, and __arm_preserves_za attributes in the previous Alpha SME spec.
Changed the status of the SME ACLE from Alpha to Beta.