updated the changelog for 6.3 (#480)

* updated the changelog for 6.3

* removed '(unreleased)' for 6.2

CHANGELOG.md

@@ -3,25 +3,25 @@
 Documentation for rocThrust available at
 [https://rocm.docs.amd.com/projects/rocThrust/en/latest/](https://rocm.docs.amd.com/projects/rocThrust/en/latest/).
 
-## (Unreleased) rocThrust 3.2.0 for ROCm 6.3
+## rocThrust 3.2.0 for ROCm 6.3
 
-### Additions
+### Added
 
 * Merged changes from upstream CCCL/thrust 2.3.2
   * Only the NVIDIA backend uses `tuple` and `pair` types from libcu++, other backends continue to
     use the original Thrust implementations and hence do not require libcu++ (CCCL) as a dependency.
 * Added the `thrust::hip::par_det` execution policy to enable bitwise reproducibility on algorithms that are not bitwise reproducible by default.
-* Fix tests failing when compiling with `-D_GLIBCXX_ASSERTIONS=ON`.
 
-### Changes
+### Changed
 
 * Enabled the upstream (thrust) test suite for execution by default. It can still be disabled by CMake option `-DENABLE_UPSTREAM_TESTS=OFF`.
 
-### Fixes
+### Resolved issues
 
 * Fixed the HIP backend not passing `TestCopyIfNonTrivial` from the upstream (thrust) test suite.
+* Fixed tests failing when compiled with `-D_GLIBCXX_ASSERTIONS=ON`.
 
-## (Unreleased) rocThrust 3.1.0 for ROCm 6.2
+## rocThrust 3.1.0 for ROCm 6.2
 
 ### Additions