dynamic-members.md: Make `d.hashCode()` and `d.runtimeType()` an error
dynamic-members.md: Make `d.hashCode()` and `d.runtimeType()` an error

A rendered version of the document as of patchset 18 is available here:
https://gist.github.com/eernstg/fc0094b0230ea18b9507092e50dab537

Change-Id: Iad21bd3e8f31847cfdc0a217249de44d5424e2b4
Reviewed-on: https://dart-review.googlesource.com/72700
Reviewed-by: Lasse R.H. Nielsen <80295e4ef244a07779f93eaa95d582bad8e316a5@google.com>

dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk