Chore(beta): Update suggested broker to Valkey + Redis agnostic documentation (#13032)

Co-authored-by: upmcplanetracker <219436948+upmcplanetracker@users.noreply.github.com>

docs/usage.md

@@ -1097,7 +1097,7 @@ Paperless-ngx consists of the following components:
   errors (i.e., wrong email credentials, errors during consuming a
   specific file, etc).
 
-- A [redis](https://redis.io/) message broker: This is a really
+- A message broker (such as Valkey or Redis): This is a really
   lightweight service that is responsible for getting the tasks from
   the webserver and the consumer to the task scheduler. These run in a
   different process (maybe even on different machines!), and