feat(docs): validate doc parameters, report errors

[pavelfeldman]

Validated and fixed some of the errors. Below is the list of outstanding issues. I did not verify types yet.

Not implemented parameter Frame.dblclick(noWaitAfter=)
Not documented parameters: Selectors.register(dict_keys(['path']))
Not documented parameters: Page.waitForRequest(dict_keys(['predicate']))
Not documented parameters: Page.waitForResponse(dict_keys(['predicate']))
Not implemented parameter Page.waitForEvent(optionsOrPredicate=)
Not documented parameters: Page.waitForEvent(dict_keys(['predicate', 'timeout']))
Not implemented parameter Page.setViewportSize(viewportSize=)
Not documented parameters: Page.setViewportSize(dict_keys(['width', 'height']))
Not implemented parameter Page.addInitScript(arg=)
Not documented parameters: Page.addInitScript(dict_keys(['path']))
Not implemented parameter Page.dblclick(noWaitAfter=)
Not implemented parameter BrowserContext.addInitScript(arg=)
Not documented parameters: BrowserContext.addInitScript(dict_keys(['path']))
Not implemented parameter BrowserContext.waitForEvent(optionsOrPredicate=)
Not documented parameters: BrowserContext.waitForEvent(dict_keys(['predicate', 'timeout']))
Not implemented parameter BrowserType.launch(firefoxUserPrefs=)
Not implemented parameter BrowserType.launch(logger=)
Not implemented parameter BrowserType.launchServer(firefoxUserPrefs=)
Not implemented parameter BrowserType.launchServer(logger=)
Not implemented parameter BrowserType.launchPersistentContext(chromiumSandbox=)
Not implemented parameter BrowserType.launchPersistentContext(logger=)
Not documented parameters: BrowserType.launchPersistentContext(dict_keys(['userDataDir']))
Not implemented parameter BrowserType.connect(logger=)

[coveralls]

Pull Request Test Coverage Report for Build 186677618

• 15 of 16 (93.75%) changed or added relevant lines in 6 files are covered.
• 24 unchanged lines in 2 files lost coverage.
• Overall coverage remained the same at 86.98%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
playwright/sync_api.py	3	4	75.0%

Files with Coverage Reduction	New Missed Lines	%
playwright/async_api.py	4	90.88%
playwright/sync_api.py	20	66.26%

Totals
Change from base Build 186248800:	0.0%
Covered Lines:	2866
Relevant Lines:	3295

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💛 - Coveralls