Updates for both discovery docs and epydoc API Documentation

Fixes: #1049

fix typo

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Fixes #<issue_number_goes_here> 🦕

🤖 I have created a release \*beep\* \*boop\* 
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### [1.12.4](https://www.github.com/googleapis/google-api-python-client/compare/v1.12.3...v1.12.4) (2020-10-20)


### Bug Fixes

* don't set content-range on empty uploads ([#1070](https://www.github.com/googleapis/google-api-python-client/issues/1070)) ([af6035f](https://www.github.com/googleapis/google-api-python-client/commit/af6035f6754a155ee6b04bbbc5c39410c7316d6a))


### Documentation

* fix typo in oauth.md ([#1058](https://www.github.com/googleapis/google-api-python-client/issues/1058)) ([30eff9d](https://www.github.com/googleapis/google-api-python-client/commit/30eff9d8276919b8c4e50df2d3b1982594423692))
* update generated docs ([#1053](https://www.github.com/googleapis/google-api-python-client/issues/1053)) ([3e17f89](https://www.github.com/googleapis/google-api-python-client/commit/3e17f8990db54bec16c48c319072799a14f5a53f)), closes [#1049](https://www.github.com/googleapis/google-api-python-client/issues/1049)
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