Add Chrome for Testing and Edge to CircleCI browsers (#6210)

Author: MikeMcC399

docs/app/continuous-integration/circleci.mdx

@@ -126,8 +126,8 @@ workflows:
 ### Chrome Example
 
 Cypress uses Electron by default to run your tests. The `install-browsers` flag
-is used to install Firefox and Chrome to run your tests. This is only needed if
-you are passing the `--browser` flag in your `cypress-command`
+is used to install Chrome, Chrome for Testing, Edge, Firefox and the geckodriver to run your tests.
+This is only needed if you are passing the `--browser` flag in your `cypress-command`.
 
 ```yaml title=".circleci/config.yml"
 version: 2.1