chore: update docs/conf.py (#56)

* changes without context

        autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

* fix(python): change autodoc_default_flags to autodoc_default_options

Source-Author: HemangChothani <[email protected]>
Source-Date: Thu Jun 18 22:50:02 2020 +0530
Source-Repo: googleapis/synthtool
Source-Sha: cd522c3b4dde821766d95c80ae5aeb43d7a41170
Source-Link: https://github.com/googleapis/synthtool/commit/cd522c3b4dde821766d95c80ae5aeb43d7a41170
3 files changed