Docs: update test-bot images and description

docs/Brew-Test-Bot.md

@@ -5,9 +5,9 @@ image: /assets/img/brewtestbot.png
 
 # Brew Test Bot
 
-`brew test-bot` is the name for the automated review and testing system funded by [our Kickstarter in 2013](https://www.kickstarter.com/projects/homebrew/brew-test-bot).
+[`brew test-bot`](Manpage.md#test-bot-options-formula) is what runs the automated review and testing system funded by [our Kickstarter in 2013](https://www.kickstarter.com/projects/homebrew/brew-test-bot).
 
-It comprises three Mac Pros hosting virtual machines, several M1 Mac minis and some cloud Ubuntu instances that run the [`test-bot.rb`](https://github.com/Homebrew/homebrew-test-bot) external command to perform automated testing of commits to the master branch, pull requests and custom builds requested by maintainers.
+It comprises three Mac Pros hosting virtual machines, several Intel and M1 Mac minis and some cloud Ubuntu instances that run the [`test-bot.rb`](https://github.com/Homebrew/homebrew-test-bot) external command to perform bottle builds and automated testing of the full lifecycle of any change to Homebrew or its taps.
 
 ## Pull Requests
 
@@ -25,10 +25,10 @@ A failed build looks like this:
 
 ---
 
-A passed build looks like this:
+A passed build that's been approved to merge looks like this:
 
 ![Passed Pull Request](assets/img/docs/brew-test-bot-passed-pr.png)
 
 ---
 
-On failed or passed builds you can click the "Details" link to view the result in GitHub Actions.
+On failed or passed builds you can click the "Details" link for each check to view its output in GitHub Actions.