Update HACKING.rst
Update HACKING.rst

In reStructuredText, we need to add a new line before blocks of formatted text (i.e. the commands samples) for them to be properly rendered.
GuidoBR/python-skyfield,ozialien/python-skyfield,exoanalytic/python-skyfield,skyfielders/python-skyfield,exoanalytic/python-skyfield,GuidoBR/python-skyfield,skyfielders/python-skyfield,ozialien/python-skyfield