[Actions] Fix indentation in `defaults.run.shell` section (#53076)

data/reusables/actions/jobs/setting-default-values-for-jobs-defaults-run-shell.md

@@ -1,4 +1,5 @@
 Use `shell` to define the `shell` for a step. {% data reusables.actions.reusable-keyword %}
 
 {% data reusables.actions.supported-shells %}
+
 {% data reusables.actions.defaults-override %}