[1.5.x] Fixed #20446 -- Documentation for SmallIntegerField does not clarify 'small'
[1.5.x] Fixed #20446 -- Documentation for SmallIntegerField does not clarify 'small'

Backport of 56e2f6ccae from master

ccn-2m/django,ccn-2m/django,alx-eu/django,imtapps/django-imt-fork,bliti/django-nonrel-1.5,ccn-2m/django,hasadna/django,bliti/django-nonrel-1.5,imtapps/django-imt-fork,hasadna/django,hasadna/django,alx-eu/django,alx-eu/django,imtapps/django-imt-fork,bliti/django-nonrel-1.5,alx-eu/django,ccn-2m/django