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

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

docs/setup.md

@@ -226,7 +226,8 @@ to enable polling and disable inotify. See [here](configuration.md#polling).
     build-essential python3-setuptools python3-wheel
     ```
 
-2.  Install `redis` >= 6.0 and configure it to start automatically.
+2.  Install a Redis-compatible broker (a current release of Valkey or
+    Redis) and configure it to start automatically.
 
 3.  Optional: Install `postgresql` and configure a database, user, and
     password for Paperless-ngx. If you do not wish to use PostgreSQL,
@@ -268,7 +269,7 @@ to enable polling and disable inotify. See [here](configuration.md#polling).
 6.  Configure Paperless-ngx. See [configuration](configuration.md) for details.
     Edit the included `paperless.conf` and adjust the settings to your
     needs. Required settings for getting Paperless-ngx running are:
-    - [`PAPERLESS_REDIS`](configuration.md#PAPERLESS_REDIS) should point to your Redis server, such as
+    - [`PAPERLESS_REDIS`](configuration.md#PAPERLESS_REDIS) should point to your broker, such as
       `redis://localhost:6379`.
     - [`PAPERLESS_DBENGINE`](configuration.md#PAPERLESS_DBENGINE) is optional, and should be one of `postgres`,
       `mariadb`, or `sqlite`
@@ -297,7 +298,7 @@ to enable polling and disable inotify. See [here](configuration.md#polling).
 
     !!! warning
 
-        Ensure your Redis instance [is secured](https://redis.io/docs/latest/operate/oss_and_stack/management/security/).
+        Ensure your broker instance [is secured](https://valkey.io/topics/security/).
 
 7.  Create the following directories if they do not already exist:
     - `/opt/paperless/media`
@@ -389,9 +390,9 @@ to enable polling and disable inotify. See [here](configuration.md#polling).
         `Require=paperless-webserver.socket` in the `webserver` script
         and configure `granian` to listen on port 80 (set `GRANIAN_PORT`).
 
-    These services rely on Redis and optionally the database server, but
+    These services rely on the broker and optionally the database server, but
     don't need to be started in any particular order. The example files
-    depend on Redis being started. If you use a database server, you
+    depend on the broker being started. If you use a database server, you
     should add additional dependencies.
 
     !!! note
@@ -494,7 +495,7 @@ installation. Keep these points in mind:
   for other services, you might as well use it for Paperless as well.
 - The task scheduler of Paperless, which is used to execute periodic
   tasks such as email checking and maintenance, requires a
-  [Redis](https://redis.io/) message broker instance. The
+  Redis-compatible message broker instance (such as Valkey or Redis). The
   Docker Compose route takes care of that.
 - The layout of the folder structure for your documents and data
   remains the same, so you can plug your old Docker volumes into
@@ -582,16 +583,16 @@ commands as well.
 
 1.  Stop and remove the Paperless container.
 2.  If using an external database, stop that container.
-3.  Update Redis configuration.
+3.  Update broker configuration.
     1. If `REDIS_URL` is already set, change it to [`PAPERLESS_REDIS`](configuration.md#PAPERLESS_REDIS)
        and continue to step 4.
 
-    1. Otherwise, add a new Redis service in `docker-compose.yml`,
+    1. Otherwise, add a new broker service in `docker-compose.yml`,
        following [the example compose
        files](https://github.com/paperless-ngx/paperless-ngx/tree/main/docker/compose)
 
     1. Set the environment variable [`PAPERLESS_REDIS`](configuration.md#PAPERLESS_REDIS) so it points to
-       the new Redis container.
+       the new broker container.
 
 4.  Update user mapping.
     1. If set, change the environment variable `PUID` to `USERMAP_UID`.