group dpkg commands

CONTRIBUTING.rst

@@ -407,10 +407,10 @@ those: ``devscripts``, ``git``, ``git-buildpackage``, ``pip`` and
      monkeysign --version
      monkeysign --test
      monkeyscan
+     dpkg --remove monkeysign
 
 6. build and test Python "wheel"::
 
-     dpkg --remove monkeysign
      python setup.py bdist_wheel
      pip install dist/*.whl
      monkeysign --version