[linter] add documentation for specify_nonobvious_local_variable_types

[IldySilva]

contributes to Contributes to dart-lang/site-www#7210

[copybara-service]

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[copybara-service]

https://dart-review.googlesource.com/c/sdk/+/493240 has been updated with the latest commits from this pull request.

[copybara-service]

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[copybara-service]

Gerrit CL has been approved, please wait for a reviewer to merge it.

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[keertip]

@IldySilva , take a look at the comments on the CL

[IldySilva]

Suggested change

	hasPublishedDocs: true
	hasPublishedDocs: false