[1.7.x] Fixed #22247 -- Replaced "upstream" with "downstream" in cache docs.
[1.7.x] Fixed #22247 -- Replaced "upstream" with "downstream" in cache docs.

Thanks valgarv at gmx.net for the report.

Backport of 60d2dde286 from master

oscaro/django,jyotsna1820/django,jyotsna1820/django,jyotsna1820/django,oscaro/django,oscaro/django,oscaro/django,jyotsna1820/django