Merge pull request #1551 from daineAMD/release/rocm-rel-6.4

Remove Unreleased from changelog for ROCm 6.4

Author: daineAMD

CHANGELOG.md

@@ -3,7 +3,7 @@
 rocBLAS documentation is available at
 [https://rocm.docs.amd.com/projects/rocBLAS/en/latest/index.html](https://rocm.docs.amd.com/projects/rocBLAS/en/latest/index.html).
 
-## (Unreleased) rocBLAS 4.4.0
+## rocBLAS 4.4.0 for ROCm 6.4
 
 ### Added