examples: Fix incorrect mount path for persistent
examples: Fix incorrect mount path for persistent

The mount path should be /hab/svc/redis/data instead of a tmp path.
This commit also updates an outdated comment.

Signed-off-by: Indradhanush Gupta <300a29a2fe6e701da25021b20bb3f00151bc5498@kinvolk.io>

kinvolk/habitat-operator,kinvolk/habitat-operator