Don't hit GitHub during bok-choy test runs

Description

The doctests for bok-choy now routinely fail on attempts to load a GitHub page, probably because we're hitting it often enough to be throttled (especially because of multiple parallel Travis workers). Fix these tests/examples to use something that works more reliably. Example of the problem:

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Jeremy Bowman
March 17, 2020, 8:55 AM
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Jeremy Bowman

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