docs: update changelog with release date and formatting

- Set release date for v2.2.0 to 2025-10-14
- Clean up changelog formatting and remove redundant sections
- Finalize release notes for the v2.2.0 release

This prepares the changelog for the official v2.2.0 release.

Author: Brett Chaldecott

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to the Kinde Python SDK will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [2.2.0] - 2025-10
+## [2.2.0] - 2025-10-14
 
 ### Fixed
 - **Security Improvements**: Fixed XSS vulnerabilities by properly escaping JSON user data and HTML error messages
@@ -81,8 +81,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Improved
 - **Code Coverage**: Enhanced test coverage and added edge cases
 - **Framework Support**: Better support for Flask and FastAPI frameworks
-- **Error Handling**: Improved error handling across multiple modules
-
-## [2.0.8] - Previous Release
-
-Initial release of Kinde Python SDK v2.0.x series. 
+- **Error Handling**: Improved error handling across multiple modules