fix(datepicker): add 'multi-year' to union type for startView property - #12518

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CLA done

CLAs look good, thanks!

Seems that travis builds fails, but not because of the code change ( response 502 Bad Gateway in one of e2e tests). Is this possible to trigger build manually?

also, mentioning @mmalerba as he asked on issue page

Travis-required fails also, but on the test of component I did not changed - how should I deal with it?

Commit message fixup: should be marked as a fix instead of docs.

Message changed, thank you!

Isn't this already included in #11049?

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