Use lookup table for Fp16 Tanh activation in hardware with SVE

Resolves: COMPMID-6901

Change-Id: Idcd3f5f5d90f4073aaf116c0586e46013fbd64f7
Signed-off-by: Gunes Bayir <gunes.bayir@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/11605
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Viet-Hoa Do <viet-hoa.do@arm.com>
Tested-by: 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 a5f61d6..d9c2c84 100644
--- a/docs/user_guide/release_version_and_change_log.dox
+++ b/docs/user_guide/release_version_and_change_log.dox
@@ -41,6 +41,10 @@
 
 @section S2_2_changelog Changelog
 
+v24.08 Public major release
+ - Optimize CPU activation functions using LUT-based implementation:
+   - Tanh function for FP16.
+
 v24.05 Public major release
  - Add @ref CLScatter operator for FP32/16, S32/16/8, U32/16/8 data types
  - Various fixes to enable FP16 kernels in armv8a multi_isa builds.