Deprecate legacy libarm_compute_core

This library is an artifact of Compute Library's legacy library architecture and no longer serves any purpose.

Users must no longer link their applications to this library and instead link only to the main `libarm_compute` library to maintain full functionality.

Resolves: COMPMID-6300

Change-Id: I7c222f511174ce9b0cfde94cf8f90da4a89f2a8b
Signed-off-by: Jakub Sujak <jakub.sujak@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9760
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Pablo Marquez Tello <pablo.tello@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
diff --git a/docs/user_guide/release_version_and_change_log.dox b/docs/user_guide/release_version_and_change_log.dox
index 59f19d4..04baaf5 100644
--- a/docs/user_guide/release_version_and_change_log.dox
+++ b/docs/user_guide/release_version_and_change_log.dox
@@ -40,6 +40,10 @@
 @note Starting from release 22.05, 'master' branch is no longer being used, it has been replaced by 'main'. Please update your clone jobs accordingly.
 
 @section S2_2_changelog Changelog
+v23.08 Public major release
+ - Deprecate the legacy 'libarm_compute_core' library. This library is an artifact of Compute Library's legacy library architecture and no longer serves any purpose.
+ Users must no longer link their applications to this library and instead link only to the main `libarm_compute` library for core functionality.
+
 v23.05 Public major release
  - New features:
    - Add new Arm® Neon™ kernels / functions: