Updated CHANGELOG to release for ROCm 6.1.0 (#1142)

* Fixed missing CHANGELOG notes from ROCm 5.5 through unreleased 6.1 (#1141)

* Update CHANGELOG.md for ROCm release 5.5

(cherry picked from commit 975327b)

* Update CHANGELOG.md for ROCm 5.7.0

(cherry picked from commit ac8db8d)

* Added ROCm 6.0 and 6.1 CHANGELOG notes.

---------

Co-authored-by: gilbertlee-amd <44450918+gilbertlee-amd@users.noreply.github.com>
(cherry picked from commit 3361abe)

* Updated CHANGELOG to release for ROCm 6.1.0

* Removed empty sections from CHANGELOG in latest releases.

CHANGELOG.md

@@ -2,15 +2,33 @@
 
 Full documentation for RCCL is available at [https://rccl.readthedocs.io](https://rccl.readthedocs.io)
 
-## Unreleased
+## RCCL 2.18.6 for ROCm 6.1.0
 ### Changed
-- Compatibility with NCCL 2.16.2
+- Compatibility with NCCL 2.18.6
+
+## RCCL 2.18.3 for ROCm 6.0.0
+### Changed
+- Compatibility with NCCL 2.18.3
+
+## RCCL 2.17.1-1 for ROCm 5.7.0
+### Changed
+- Compatibility with NCCL 2.17.1-1
+- Performance tuning for some collective operations
 ### Added
+- Minor improvements to MSCCL codepath
+- NCCL_NCHANNELS_PER_PEER support
+- Improved compilation performance
+- Support for gfx94x
+### Fixed
+- Potential race-condition during ncclSocketClose()
+
+## RCCL 2.16.2 for ROCm 5.6.0
+### Changed
+- Compatibility with NCCL 2.16.2
 ### Fixed
 - Remove workaround and use indirect function call
-### Removed
 
-## Unreleased - RCCL 2.15.5 for ROCm 5.5.0
+## RCCL 2.15.5 for ROCm 5.5.0
 ### Changed
 - Compatibility with NCCL 2.15.5
 - Unit test executable renamed to rccl-UnitTests