Update python.md

[chadgates]

example states wrong proto for recreation (route_guide instead of helloworld)

[googlebot]

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[chadgates]

I signed it!

On 18 Nov 2016, at 16:43, googlebot notifications@github.com wrote:

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ https://cla.developers.google.com/ to sign.

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[googlebot]

CLAs look good, thanks!