Update release notes for the 23.05 release.

Partially resolves: [COMPMID-5888]

Signed-off-by: Omar Al Khatib <omar.alkhatib@arm.com>
Change-Id: I0313af488050d2babb47b3e164c111e11d84021f
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9605
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: SiCong Li <sicong.li@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 80cf3ae..59f19d4 100644
--- a/docs/user_guide/release_version_and_change_log.dox
+++ b/docs/user_guide/release_version_and_change_log.dox
@@ -41,10 +41,22 @@
 
 @section S2_2_changelog Changelog
 v23.05 Public major release
- - Deprecate dynamic block shape in @ref NEBatchToSpaceLayer
- - Deprecate dynamic block shape in @ref CLBatchToSpaceLayer
- - New Arm® Neon™ kernels / functions :
-   - NEReorderLayer (aarch64 only)
+ - New features:
+   - Add new Arm® Neon™ kernels / functions:
+      - @ref NEMatMul for QASYMM8, QASYMM8_SIGNED, FP32 and FP16, with batch support.
+      - NEReorderLayer (aarch64 only)
+   - Add new OpenCL™ kernels / functions:
+      - @ref CLMatMul support for QASYMM8, QASYMM8_SIGNED, FP32 and FP16, with batch support.
+   - Add support for the multiple dimensions in the indices parameter for both the Arm® Neon™ and OpenCL™ implementations of the Gather Layer.
+   - Add support for dynamic weights in @ref CLFullyConnectedLayer and @ref NEFullyConnectedLayer for all data types.
+   - Add support for cropping in the Arm® Neon™ and OpenCL™: implementations of the BatchToSpace Layer for all data types.
+   - Add support for quantized data types for the ElementwiseUnary Operators for Arm® Neon™.
+   - Implement RSQRT for quantized data types on OpenCL™.
+   - Add FP16 depthwise convolution kernels for SME2.
+ - Performance optimizations:
+   - Improve CLTuner exhaustive mode tuning time.
+ - Deprecate dynamic block shape in @ref NEBatchToSpaceLayer and @ref CLBatchToSpaceLayer.
+ - Various optimizations and bug fixes.
 
 v23.02.1 Public patch release
  - Allow mismatching data layouts between the source tensor and weights for \link cpu::CpuGemmDirectConv2d CpuGemmDirectConv2d \endlink with fixed format kernels.