Use markdown table instead of HTML table in Element.updateChild documentation #20721
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Fixes dart-lang/dartdoc#1467.
With dart-lang/dartdoc#1453 fixed, @Hixie's preferred solution to dart-lang/dartdoc#1467 is now possible -- using markdown tables. Comment references are automatically linked in dartdoc's markdown tables.
This PR does that.
Compare this:
to the original at https://master-docs-flutter-io.firebaseapp.com/flutter/widgets/Element/updateChild.html.