Fill in some gaps as found at the doc guide at python.org/dev/ (so the latter can simply redirect to here).
Fill in some gaps as found at the doc guide at python.org/dev/ (so the latter can simply redirect to here).

ezio-melotti/devguide,jeff5/jython-devguide,jython/devguide,jython/devguide,jeff5/jython-devguide,jeff5/jython-devguide,jython/devguide