docs: correct debugging task step (angular#46832)

Also remove lint errors.

Fix: angular#42781

PR Close angular#46832

aio/content/guide/test-debugging.md

@@ -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.
 
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