Bump sphinxcontrib-programoutput from 0.17 to 0.18 in /docs (#4528)

Bumps [sphinxcontrib-programoutput](https://github.com/NextThought/sphinxcontrib-programoutput) from 0.17 to 0.18.
- [Changelog](https://github.com/OpenNTI/sphinxcontrib-programoutput/blob/master/CHANGES.rst)
- [Commits](https://github.com/NextThought/sphinxcontrib-programoutput/compare/0.17...0.18

)

---
updated-dependencies:
- dependency-name: sphinxcontrib-programoutput
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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