Remove v23.08 release notes

Partially Resolves: COMPMID-6328
Signed-off-by: ramy.elgammal@arm.com <ramy.elgammal@arm.com>
Change-Id: I9eca6ddbe8fcefa647f8793f439a766c2b364a52
diff --git a/docs/user_guide/release_version_and_change_log.dox b/docs/user_guide/release_version_and_change_log.dox
index e323545..362049d 100644
--- a/docs/user_guide/release_version_and_change_log.dox
+++ b/docs/user_guide/release_version_and_change_log.dox
@@ -40,14 +40,6 @@
 @note Starting from release 22.05, 'master' branch is no longer being used, it has been replaced by 'main'.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.
- - Various optimizations and bug fixes.
- - New features
-   - Add new OpenCL™ kernels:
-     - @ref opencl::kernels::ClMatMulNativeMMULKernel support for FP32 and FP16, with batch support
-
 v23.05.1 Public patch release
  - Enable CMake and Bazel option to build multi_isa without FP16 support.
  - Fix compilation error in NEReorderLayer (aarch64 only).