chore: fix formatting in docs/index.rst (#48)

Source-Link: googleapis/synthtool@aac3331 Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:3f66ebf145a16bb07a2fcbdb79bcb5743a791e3dc46015b0de22cacdd2875f64 Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
googleapis · Oct 20, 2021 · d320012 · d320012
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diff --git a/packages/google-cloud-dataflow-client/.github/.OwlBot.lock.yaml b/packages/google-cloud-dataflow-client/.github/.OwlBot.lock.yaml
@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:3728d8fd14daa46a96d04ce61c6451a3ac864dc48fb71eecbb4411f4a95618d4
+  digest: sha256:3f66ebf145a16bb07a2fcbdb79bcb5743a791e3dc46015b0de22cacdd2875f64
diff --git a/packages/google-cloud-dataflow-client/docs/index.rst b/packages/google-cloud-dataflow-client/docs/index.rst
@@ -11,12 +11,13 @@ API Reference
     dataflow_v1beta3/services
     dataflow_v1beta3/types
 
+
 Changelog
 ---------
 
 For a list of all ``google-cloud-dataflow-client`` releases:
 
 .. toctree::
-   :maxdepth: 2
+    :maxdepth: 2
 
-   changelog
+    changelog