Fixing rendering of code block for newsfragment command (apache#44419)

contributing-docs/16_contribution_workflow.rst

@@ -200,8 +200,9 @@ Step 4: Prepare PR
      you should follow the template in ``newsfragments/template.significant.rst`` to include summary, body, change type and migrations rules needed.
      This can also be done by the following command.
 
-.. code-block:: bash
-     uv tool run towncrier create --dir . --config newsfragments/config.toml --content "`cat newsfragments/template.significant.rst`"
+     .. code-block:: bash
+
+        uv tool run towncrier create --dir . --config newsfragments/config.toml --content "`cat newsfragments/template.significant.rst`"
 
 2. Rebase your fork, squash commits, and resolve all conflicts. See `How to rebase PR <#how-to-rebase-pr>`_
    if you need help with rebasing your change. Remember to rebase often if your PR takes a lot of time to