Pydgraph examples refresh to v21.03.x

FYI.

Could these be merged, my PR and the other example PR?

I fixed a comment-doc bug that testing would have hit.

There are at two outstanding issues that I think need to be done with this client library:

  • unit tests fail (did not yet investigate)
  • briefly looked at api.proto and supporting code, doesn’t look like namespaces are yet supported

@dmai @MichelDiz

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