[IMPR] Minor improvements of noreferences.py script
[IMPR] Minor improvements of noreferences.py script

* Removed namespace param as it is already included
by pagegenerators
* Added default comment for non-default params
* Changed copyright for Pywikibot team

Change-Id: I0e4499d5c55e8c430340a5b64d9c478f9a35666d

wikimedia/pywikibot-core,PersianWikipedia/pywikibot-core,wikimedia/pywikibot-core