"Examples" in docs are broken

[jsstevenson]

Describe the bug Running code verbatim from both "Fetching gene information" and "Fetch PubMed information" raises an IndexError and an AttributeError, respectively.

To Reproduce Run code in https://eutils.readthedocs.io/en/stable/using.html#examples in a console.

Expected behavior It should not raise said errors.

Additional context It's a little tricky to maintain code that gets data from a live external service, but I think some of these come down to typos and could be fixed quickly.