fix(self-hosted): Remove Zookeeper notes (#14241)

Author: evanpurkhiser

develop-docs/application-architecture/overview.mdx

@@ -22,7 +22,6 @@ graph TD
   snuba --> kafka
   snuba --> redis
   snuba --> clickhouse
-  kafka --> zookeeper
   sentry_web --> sentry_worker["Sentry (worker)"]
   sentry_worker --> memcached
   sentry_worker --> redis

develop-docs/self-hosted/backup.mdx

@@ -180,7 +180,6 @@ data are already defined as global volumes at install time and are prefixed with
 - `sentry-data`
 - `sentry-postgres`
 - `sentry-redis`
-- `sentry-zookeeper`
 - `sentry-kafka`
 - `sentry-clickhouse`
 - `sentry-symbolicator`

develop-docs/self-hosted/troubleshooting/kafka.mdx

@@ -64,10 +64,9 @@ The _nuclear option_ is removing all Kafka-related volumes and recreating them w
    ```shell
    docker compose down --volumes
    ```
-2. Remove the Kafka & Zookeeper related volumes:
+2. Remove the the Kafka volume:
    ```shell
    docker volume rm sentry-kafka
-   docker volume rm sentry-zookeeper
    ```
 
  3. Run the install script again: