message: docs: correct debugging task step
  Also remove lint errors.
  Fix:
  PR Close
diff: @@ -7,12 +7,12 @@ Debug specs in the browser in the same way that you debug an application.
  1. Reveal the Karma browser window.
  See [Set up testing](guide/testing#set-up-testing) if you need help with this step.
  -1. Click the **DEBUG** button; it opens a new browser tab and re-runs the tests.
  -1. Open the browser's "Developer Tools" \(`Ctrl-Shift-I` on Windows; `Command-Option-I` in macOS\).
  -1. Pick the "sources" section.
  -1. Open the `1st.spec.ts` test file \(Control/Command-P, then start typing the name of the file\).
  -1. Set a breakpoint in the test.
  -1. Refresh the browser, and it stops at the breakpoint.
  +1. Click the **DEBUG** button to open a new browser tab and re-run the tests.
  +2. Open the browser's **Developer Tools**. On Windows, press `Ctrl-Shift-I`. On macOS, press `Command-Option-I`.
  +3. Pick the **Sources** section.
  +4. Press `Control/Command-P`, and then start typing the name of your test file to open it.
  +5. Set a breakpoint in the test.
  +6. Refresh the browser, and notice how it stops at the breakpoint.
  <div class="lightbox">
  