chore: remove old comment from playwright config (#27973)

Issue number: #

---------

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## What is the current behavior?
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Shawn noted that I had an outdated comment in the `playwright.config.ts`
file when working on
#27961:
#27961 (review)
 
## What is the new behavior?
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this PR. -->

- Remove the old comment

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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core/playwright.config.ts

@@ -62,7 +62,6 @@ const config: PlaywrightTestConfig = {
   },
   /* Fail the build on CI if you accidentally left test.only in the source code. */
   forbidOnly: !!process.env.CI,
-  /* Fail fast on CI */
   maxFailures: 0,
   retries: 2,
   reportSlowTests: null,