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Fix a few more dartdoc errors (#9907)

Turns out that `[]:` means something in markdown, so you have to
escape the `:` with a backslash.
I
Ian Hickson committed
58a11f01175e9513940109d784ebe9b1f196e521
Parent: f4f68df
Committed by GitHub <noreply@github.com> on 5/9/2017, 10:33:01 PM