I've love to see a single stand-alone ZenDesk article on "Cache Purging."
With multiple ways of flushing various caches, it might be nice to explain (show?) what each one does and when/why to use them...
a) Flushing with "GridPane Redis Object Cache" Plugin
b) Purge with "GridPane Nginx Cache Purger" (if using FastCGI)
c) Purge with "Nginx Settings" Plugin
d) Clear All Nginx Caches in UI Tools->Self Help
Also, since the last one is likely the "best" one, you may want to add a reference to this possible article about the GP CLI command of "gp fix cached"