Add note on Shadow DOM behavior about dialog focusing steps.#2394

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TakayoshiKochi wants to merge 2 commits intowhatwg:masterfrom TakayoshiKochi:dialog-focus

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Commits on Feb 24, 2017

Add a warning on Shadow DOM behavior usage for dialog focusing steps.
Takayoshi Kochi
committed
Update the warning sentence.
Takayoshi Kochi
committed