[1.5.X] Fixed #19346 - Typo in docs/ref/contrib/gis/install/index.txt
[1.5.X] Fixed #19346 - Typo in docs/ref/contrib/gis/install/index.txt

Backport of c13912ac7f from master

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