Clarify that when creating a feature branch hg push --new-branch is needed.
Clarify that when creating a feature branch hg push --new-branch is needed.

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