[1.5.X] Fixed #19090 - Added PostgreSQL connection note.
[1.5.X] Fixed #19090 - Added PostgreSQL connection note.

Thanks Melevir for the patch.

Backport of 249c3d730e from master

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