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 <50404902+HemangChothani@users.noreply.github.com>
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
diff --git a/synth.metadata b/synth.metadata
index abbe2b0..26ad997 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -3,15 +3,15 @@
     {
       "git": {
         "name": ".",
-        "remote": "git@github.com:googleapis/python-api-core",
-        "sha": "8212bb7f54ca08a498faddaca513580a1f890dbd"
+        "remote": "https://github.com/googleapis/python-api-core.git",
+        "sha": "98f03c8dc6f47379bdc8ded8efd24b577e95326d"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "f13864cd532f98a4682cec48105580fa9a5c9978"
+        "sha": "cd522c3b4dde821766d95c80ae5aeb43d7a41170"
       }
     }
   ]