message: Dedent compatibility blocks
  This is to avoid accidentally triggering markdown's 4-space code-formatting
diff: @@ -290,7 +290,9 @@ def _build_compatibility(compatibility):
  for key in sorted_keys:
  value = compatibility[key]
  - parts.append('\n\n#### %s compatibility\n%s\n' % (key, value))
  + # Dedent so that it does not trigger markdown code formatting.
  + value = textwrap.dedent(value)
  + parts.append('\n\n#### %s Compatibility\n%s\n' % (key.title(), value))
  return ''.join(parts)
  