update changelog with release 3.2.0 (ansible-collections#750)

SUMMARY
Minor/cosmetic documentation change with adding release 3.2.0 to changelog for master as the release is from stable-3 branch
ISSUE TYPE

Docs Pull Request

COMPONENT NAME
CHANGELOG.md
ADDITIONAL INFORMATION
Most probably this PR should be backported to the stable-5 branch after the merge to the main and should be with a skip-changelog tag.

Reviewed-by: Mike Graves <[email protected]>

Author: yurnov

CHANGELOG.rst

@@ -55,6 +55,19 @@ Bugfixes
 - helm - use ``reuse-values`` when running ``helm diff`` command (https://github.com/ansible-collections/kubernetes.core/issues/680).
 - integrations test helm_kubeconfig - set helm version to v3.10.3 to avoid incompatability with new bitnami charts (https://github.com/ansible-collections/kubernetes.core/pull/670).
 
+v3.2.0
+======
+
+Release Summary
+---------------
+This release comes with documentation updates.
+
+Minor Changes
+-------------
+
+- inventory/k8s.py - Defer removal of k8s inventory plugin to version 6.0.0 (https://github.com/ansible-collections/kubernetes.core/pull/734).
+- connection/kubectl.py - Added an example of using the kubectl connection plugin to the documentation (https://github.com/ansible-collections/kubernetes.core/pull/741).
+
 v3.1.0
 ======