chore(python): skip docfx in main presubmit (#661)

* chore(python): skip docfx in main presubmit

* fix: properly template the repo name

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Fri Jan 8 10:32:13 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: fb53b6fb373b7c3edf4e55f3e8036bc6d73fa483
Source-Link: https://github.com/googleapis/synthtool/commit/fb53b6fb373b7c3edf4e55f3e8036bc6d73fa483
diff --git a/synth.metadata b/synth.metadata
index 5e1ef9a..db9feff 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-auth-library-python.git",
-        "sha": "9c4200dff31986b7ff300126e9aa35d14aa84dba"
+        "sha": "647290a2dfc797067f7966c1dae512359e6bb7e7"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "da5c6050d13b4950c82666a81d8acd25157664ae"
+        "sha": "fb53b6fb373b7c3edf4e55f3e8036bc6d73fa483"
       }
     }
   ],