Update CHANGELOG for Jira Cloud API changes

Removed detailed Jira migration notes and replaced with a summary of the update for Jira Cloud API deprecation.

Author: jertel

CHANGELOG.md

@@ -23,10 +23,7 @@
 - Update build libraries: pylint, pytest, pytest-cov, pytest-xdist, sphinx, tox - [#1706](https://github.com/jertel/elastalert2/pull/1706) - @nsano-rururu
 - Update docs build to use Ubuntu 24.40 and Python 3.13 - [#1708](https://github.com/jertel/elastalert2/pull/1708) - @jertel
 - Cleanup unused imports - [#1708](https://github.com/jertel/elastalert2/pull/1708) - @jertel
-- **Jira Migration**: Updated for Jira Cloud API deprecation (legacy JQL search endpoints will be removed after
-  May 1, 2025). ElastAlert 2 now uses the Jira client's `enhanced_search_issues()` method for ticket bumping
-  behavior, which internally uses the new Jira API endpoints. This change is transparent for users with compatible
-  Jira library versions (3.10.5+). No configuration changes required.
+- Updated for Jira Cloud API deprecation - [#1709](https://github.com/jertel/elastalert2/pull/1709) - @leesmith110
 
 # 2.26.0