[Cache] Mention ttaht user/password are not supported for Redis DSN

Author: javiereguiluz

components/cache/adapters/redis_adapter.rst

@@ -55,23 +55,25 @@ helper method allows creating and configuring the Redis client class instance us
         'redis://localhost'
     );
 
-The DSN can specify either an IP/host (and an optional port) or a socket path, as well as a
-password and a database index. To enable TLS for connections, the scheme ``redis`` must be
-replaced by ``rediss`` (the second ``s`` means "secure").
+The DSN can specify either an IP/host (and an optional port) or a socket path, as
+well as a database index. To enable TLS for connections, the scheme ``redis`` must
+be replaced by ``rediss`` (the second ``s`` means "secure").
 
 .. note::
 
     A `Data Source Name (DSN)`_ for this adapter must use either one of the following formats.
 
     .. code-block:: text
 
-        redis[s]://[pass@][ip|host|socket[:port]][/db-index]
+        redis[s]://[ip|host|socket[:port]][/db-index]
 
     .. code-block:: text
 
-        redis[s]:[[user]:pass@]?[ip|host|socket[:port]][&params]
+        redis[s]:[ip|host|socket[:port]][&params]
 
-    Values for placeholders ``[user]``, ``[:port]``, ``[/db-index]`` and ``[&params]`` are optional.
+    Values for placeholders ``[:port]``, ``[/db-index]`` and ``[&params]`` are optional.
+    When using Symfony 5.x, you can't define a user or password for the connection
+    DSN. That feature was added in the following Symfony versions.
 
 Below are common examples of valid DSNs showing a combination of available values::