Update release note

Resolve: COMPMID-4474

Signed-off-by: Sheri Zhang <sheri.zhang@arm.com>
Change-Id: I1b5aad84dbbca35689aefa48b702bd1a216b07b2
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5592
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: 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 b9e3b37..0f4d4cc 100644
--- a/docs/user_guide/release_version_and_change_log.dox
+++ b/docs/user_guide/release_version_and_change_log.dox
@@ -41,8 +41,35 @@
 @section S2_2_changelog Changelog
 
 v21.05 Public major release
- - Removed computer vision support from Arm® Neon™ backend
- - Removed the following functions:
+ - Various bug fixes.
+ - Various optimisations.
+ - Various documentation updates:
+   - Add supported operators and coressponding Android NNAPI operators.
+   - Documentaiton reorg into user guide and contributor guide.
+ - Add support for a global allocator for OpenCL tensors
+ - Add experimental support for [CLVK](https://github.com/kpet/clvk).
+ - Add data type S32 support for:
+  - @ref opencl::kernels::ClArithmeticKernel
+ - Add data type QASYMM8 support for:
+  - @ref CLROIPoolingLayer
+  - @ref CLROIPoolingLayerKernel
+  - @ref NEROIPoolingLayer
+  - @ref NEROIPoolingLayerKernel
+ - Add per-channel quantization support for:
+  - @ref CLDeconvolutionLayer
+  - @ref CLDirectDeconvolutionLayer
+  - @ref NEConvolutionLayer
+  - @ref NEDeconvolutionLayer
+ - Remove padding from OpenCL kernels:
+   - @ref CLL2NormalizeLayerKernel
+   - @ref CLDepthwiseConvolutionLayer3x3NHWCKernel
+   - @ref CLNormalizationLayerKernel
+   - @ref CLNormalizePlanarYUVLayerKernel
+   - @ref opencl::kernels::ClMulKernel
+   - @ref CLReductionOperationKernel
+   - @ref CLROIPoolingLayerKernel
+ - Remove computer vision support from Arm® Neon™ backend
+ - Remove the following functions:
    - NEAbsoluteDifference
    - NEAccumulate
    - NEBox3x3
@@ -83,10 +110,9 @@
    - NEThreshold
    - NEWarpAffine
    - NEWarpPerspectiveKernel
-
  - Remove all GLES kernels / functions / tests / examples
- - Removed computer vision support from CL backend
- - Removed the following functions:
+ - Remove computer vision support from CL backend
+ - Remove the following functions:
    - CLAbsoluteDifference
    - CLAccumulate
    - CLBox3x3