Update CHANGELOG.md for telemetry changes

Author: robertbrignull

extensions/ql-vscode/CHANGELOG.md

@@ -6,6 +6,7 @@
 - It is now possible to show the language of query history items using the `%l` specifier in the `codeQL.queryHistory.format` setting. Note that this only works for queries run after this upgrade, and older items will show `unknown` as a language. [#2892](https://github.com/github/vscode-codeql/pull/2892)
 - Increase the required version of VS Code to 1.82.0. [#2877](https://github.com/github/vscode-codeql/pull/2877)
 - Fix a bug where the query server was restarted twice after configuration changes. [#2884](https://github.com/github/vscode-codeql/pull/2884).
+- Add support for the `telemetry.telemetryLevel` setting. For more information, see the [telemetry documentation](https://codeql.github.com/docs/codeql-for-visual-studio-code/about-telemetry-in-codeql-for-visual-studio-code). [#2824](https://github.com/github/vscode-codeql/pull/2824).
 
 ## 1.9.1 - 29 September 2023