Add a changelog entry

Author: SamiAario-AMD

CHANGELOG.md

@@ -23,6 +23,7 @@ Documentation for Composable Kernel available at [https://rocm.docs.amd.com/proj
 ## Composable Kernel 1.2.0 for ROCm 7.2.0
 
 ### Added
+* Added support for f8 x bf8 on CompV3, and f8 x bf8 with K_BlockSize 32 on CompV4
 * Added support for bf16 data type to grouped_gemm and grouped_gemm_preshuffle.
 * Added Col-Col-Row-Col layout support for aquant mode in blockscale GEMM.
 * Added support for mixed precision fp8 x bf8 universal GEMM and weight preshuffle GEMM.