docs: add packages to requirements.txt, to fix import errors in sphinx #677
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Purpose
Generating docs for a given module requires importing it, so we need to install any packages it uses at the top level. E.g. the docs for europe_tub is missing for this reason.
What the code is doing
Add packages to requirements.txt and fix one place where the newline causes docs to not render properly (this one)
Testing
Built the docs locally.
Time estimate
1 min