Don't have redis-cluster as possible cache/session adapter in docs (#30794)

This is because it doesn't exist as an adapter. The `redis` adapter
already handles Redis cluster configurations.

Fixes #30534.

custom/conf/app.example.ini

@@ -1456,7 +1456,7 @@ LEVEL = Info
 ;; Batch size to send for batched queues
 ;BATCH_LENGTH = 20
 ;;
-;; Connection string for redis queues this will store the redis or redis-cluster connection string.
+;; Connection string for redis queues this will store the redis (or Redis cluster) connection string.
 ;; When `TYPE` is `persistable-channel`, this provides a directory for the underlying leveldb
 ;; or additional options of the form `leveldb://path/to/db?option=value&....`, and will override `DATADIR`.
 ;CONN_STR = "redis://127.0.0.1:6379/0"
@@ -1740,9 +1740,8 @@ LEVEL = Info
 ;; For "memory" only, GC interval in seconds, default is 60
 ;INTERVAL = 60
 ;;
-;; For "redis", "redis-cluster" and "memcache", connection host address
-;; redis: `redis://127.0.0.1:6379/0?pool_size=100&idle_timeout=180s`
-;; redis-cluster: `redis+cluster://127.0.0.1:6379/0?pool_size=100&idle_timeout=180s`
+;; For "redis" and "memcache", connection host address
+;; redis: `redis://127.0.0.1:6379/0?pool_size=100&idle_timeout=180s` (or `redis+cluster://127.0.0.1:6379/0?pool_size=100&idle_timeout=180s` for a Redis cluster)
 ;; memcache: `127.0.0.1:11211`
 ;; twoqueue: `{"size":50000,"recent_ratio":0.25,"ghost_ratio":0.5}` or `50000`
 ;HOST =
@@ -1772,15 +1771,14 @@ LEVEL = Info
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;
-;; Either "memory", "file", "redis", "redis-cluster", "db", "mysql", "couchbase", "memcache" or "postgres"
+;; Either "memory", "file", "redis", "db", "mysql", "couchbase", "memcache" or "postgres"
 ;; Default is "memory". "db" will reuse the configuration in [database]
 ;PROVIDER = memory
 ;;
 ;; Provider config options
 ;; memory: doesn't have any config yet
 ;; file: session file path, e.g. `data/sessions`
-;; redis: `redis://127.0.0.1:6379/0?pool_size=100&idle_timeout=180s`
-;; redis-cluster: `redis+cluster://127.0.0.1:6379/0?pool_size=100&idle_timeout=180s`
+;; redis: `redis://127.0.0.1:6379/0?pool_size=100&idle_timeout=180s` (or `redis+cluster://127.0.0.1:6379/0?pool_size=100&idle_timeout=180s` for a Redis cluster)
 ;; mysql: go-sql-driver/mysql dsn config string, e.g. `root:password@/session_table`
 ;PROVIDER_CONFIG = data/sessions ; Relative paths will be made absolute against _`AppWorkPath`_.
 ;;

docs/content/administration/config-cheat-sheet.en-us.md

@@ -492,7 +492,7 @@ Configuration at `[queue]` will set defaults for queues with overrides for indiv
 - `DATADIR`: **queues/common**: Base DataDir for storing level queues. `DATADIR` for individual queues can be set in `queue.name` sections. Relative paths will be made absolute against `%(APP_DATA_PATH)s`.
 - `LENGTH`: **100000**: Maximal queue size before channel queues block
 - `BATCH_LENGTH`: **20**: Batch data before passing to the handler
-- `CONN_STR`: **redis://127.0.0.1:6379/0**: Connection string for the redis queue type. For `redis-cluster` use `redis+cluster://127.0.0.1:6379/0`. Options can be set using query params. Similarly, LevelDB options can also be set using: **leveldb://relative/path?option=value** or **leveldb:///absolute/path?option=value**, and will override `DATADIR`
+- `CONN_STR`: **redis://127.0.0.1:6379/0**: Connection string for the redis queue type. If you're running a Redis cluster, use `redis+cluster://127.0.0.1:6379/0`. Options can be set using query params. Similarly, LevelDB options can also be set using: **leveldb://relative/path?option=value** or **leveldb:///absolute/path?option=value**, and will override `DATADIR`
 - `QUEUE_NAME`: **_queue**: The suffix for default redis and disk queue name. Individual queues will default to **`name`**`QUEUE_NAME` but can be overridden in the specific `queue.name` section.
 - `SET_NAME`: **_unique**: The suffix that will be added to the default redis and disk queue `set` name for unique queues. Individual queues will default to **`name`**`QUEUE_NAME`_`SET_NAME`_ but can be overridden in the specific `queue.name` section.
 - `MAX_WORKERS`: **(dynamic)**: Maximum number of worker go-routines for the queue. Default value is "CpuNum/2" clipped to between 1 and 10.
@@ -777,11 +777,11 @@ and
 
 ## Cache (`cache`)
 
-- `ADAPTER`: **memory**: Cache engine adapter, either `memory`, `redis`, `redis-cluster`, `twoqueue` or `memcache`. (`twoqueue` represents a size limited LRU cache.)
+- `ADAPTER`: **memory**: Cache engine adapter, either `memory`, `redis`, `twoqueue` or `memcache`. (`twoqueue` represents a size limited LRU cache.)
 - `INTERVAL`: **60**: Garbage Collection interval (sec), for memory and twoqueue cache only.
-- `HOST`: **_empty_**: Connection string for `redis`, `redis-cluster` and `memcache`. For `twoqueue` sets configuration for the queue.
+- `HOST`: **_empty_**: Connection string for `redis` and `memcache`. For `twoqueue` sets configuration for the queue.
   - Redis: `redis://:macaron@127.0.0.1:6379/0?pool_size=100&idle_timeout=180s`
-  - Redis-cluster `redis+cluster://:macaron@127.0.0.1:6379/0?pool_size=100&idle_timeout=180s`
+    - For a Redis cluster: `redis+cluster://:macaron@127.0.0.1:6379/0?pool_size=100&idle_timeout=180s`
   - Memcache: `127.0.0.1:9090;127.0.0.1:9091`
   - TwoQueue LRU cache: `{"size":50000,"recent_ratio":0.25,"ghost_ratio":0.5}` or `50000` representing the maximum number of objects stored in the cache.
 - `ITEM_TTL`: **16h**: Time to keep items in cache if not used, Setting it to -1 disables caching.
@@ -793,7 +793,7 @@ and
 
 ## Session (`session`)
 
-- `PROVIDER`: **memory**: Session engine provider \[memory, file, redis, redis-cluster, db, mysql, couchbase, memcache, postgres\]. Setting `db` will reuse the configuration in `[database]`
+- `PROVIDER`: **memory**: Session engine provider \[memory, file, redis, db, mysql, couchbase, memcache, postgres\]. Setting `db` will reuse the configuration in `[database]`
 - `PROVIDER_CONFIG`: **data/sessions**: For file, the root path; for db, empty (database config will be used); for others, the connection string. Relative paths will be made absolute against _`AppWorkPath`_.
 - `COOKIE_SECURE`:**_empty_**: `true` or `false`. Enable this to force using HTTPS for all session access. If not set, it defaults to `true` if the ROOT_URL is an HTTPS URL.
 - `COOKIE_NAME`: **i\_like\_gitea**: The name of the cookie used for the session ID.