[1.6.x] Clarified that LocMemCache is per-process; refs #7639.
[1.6.x] Clarified that LocMemCache is per-process; refs #7639.

Thanks projectgus for the suggestion.

Backport of c37000ab04 from master

felixjimenez/django,django-nonrel/django,felixjimenez/django,django-nonrel/django,django-nonrel/django,felixjimenez/django,felixjimenez/django,django-nonrel/django,redhat-openstack/django,redhat-openstack/django,redhat-openstack/django,redhat-openstack/django