chore: update generated docs (#1115)

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Synth log will be available here:
https://source.cloud.google.com/results/invocations/2ed9ab0e-55b4-4ab2-aede-c95e765f7376/targets

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Source-Link: https://github.com/googleapis/discovery-artifact-manager/commit/0bed8bdae25d545e796cfcdd7a9bfffff11e69da
Source-Link: https://github.com/googleapis/synthtool/commit/c2de32114ec484aa708d32012d1fa8d75232daf5
diff --git a/synth.metadata b/synth.metadata
index 6f4d473..4df0b93 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-api-python-client.git",
-        "sha": "af918e8ef422438aaca0c468de8b3b2c184d884e"
+        "sha": "b6971b0405ba59d905b84fa5fc8e27e12d29b70c"
       }
     },
     {