Update CHANGELOG.md

Author: mgsium

extensions/ql-vscode/CHANGELOG.md

@@ -9,8 +9,6 @@
 - Allow case-insensitive project slugs for GitHub repositories when adding a CodeQL database from LGTM. [#978](https://github.com/github/vscode-codeql/pull/961)
 - Add a _CodeQL: Preview Query Help_ command to generate Markdown previews of `.qhelp` query help files. This command should only be run in trusted workspaces. See https://codeql.github.com/docs/codeql-cli/testing-query-help-files for more information about query help. [#988](https://github.com/github/vscode-codeql/pull/988)
 - Make "Open Referenced File" command accessible from the active editor menu. [#989](https://github.com/github/vscode-codeql/pull/989)
-- Add a _CodeQL: Preview Query Help File_ command to generate and preview query documentation in markdown format from a .qhelp file. [#988](https://github.com/github/vscode-codeql/pull/988)
-- Add a _CodeQL: Preview Query Help_ command to generate Markdown previews of `.qhelp` query help files. See https://codeql.github.com/docs/codeql-cli/testing-query-help-files for more information about query help. [#988](https://github.com/github/vscode-codeql/pull/988)
 
 ## 1.5.6 - 07 October 2021