docs: improve test.step documentation

[dgozman]

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[github-actions]

Test results for "tests 1"

1 failed
❌ [playwright-test] › reporter-html.spec.ts:705:5 › created › should use file-browser friendly extensions for buffer attachments based on contentType

8 flaky

⚠️ [chromium] › library/tracing.spec.ts:239:5 › should not include trace resources from the previous chunks
⚠️ [firefox] › library/tracing.spec.ts:239:5 › should not include trace resources from the previous chunks
⚠️ [chromium] › library/tracing.spec.ts:239:5 › should not include trace resources from the previous chunks
⚠️ [playwright-test] › ui-mode-test-progress.spec.ts:167:5 › should update tracing network live
⚠️ [webkit] › library/browsercontext-reuse.spec.ts:50:1 › should reset serviceworker
⚠️ [webkit] › page/page-goto.spec.ts:266:3 › should fail when navigating to bad SSL
⚠️ [webkit] › page/page-wait-for-navigation.spec.ts:85:3 › should work with clicking on links which do not commit navigation
⚠️ [playwright-test] › ui-mode-test-run.spec.ts:86:5 › should run on hover

25846 passed, 603 skipped
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Merge workflow run.