Add / to punctuators that trip up ASI

[ghost]

Starting a line with / will make ASI think it's a division not a regex literal (although starting a line with / is rare).

[zkat]

Ever since npm@3, we've been using standard as our linter, and a nice big chunk of this style guide is basically absorbed into that, and its various rules. This page needs a lot more done and it might be worth removing entirely. :\ cc @ashleygwilliams for doc issue

[iarna]

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