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Fix dartdocs (#10361)

You can't have a newline between the `]` and the `(` in an image in markdown it turns out.
I
Ian Hickson committed
767ab66c25b5b303a030d46b2ea3711d25a30001
Parent: f50cadd
Committed by GitHub <noreply@github.com> on 5/27/2017, 7:45:25 AM