minor #19996 [Cache] Fix redis adapter config to work with tags (Huluti)

This PR was submitted for the 7.1 branch but it was merged into the 5.4 branch instead.

Discussion
----------

[Cache] Fix redis adapter config to work with tags

I found that to work with redis and tags using this config was not working (tag not set and invalidation not working):

```
 'adapter' => 'cache.adapter.redis',
 'tags' => true,
```

While with this one all was working fine:

```
adapter' => 'cache.adapter.redis_tag_aware',
```

Up to you if you think that it makes sense :)

Commits
-------

a04e07c Fix redis adapter config to work with tags

Author: xabbuh

cache.rst

@@ -618,8 +618,7 @@ to enable this feature. This could be added by using the following configuration
             cache:
                 pools:
                     my_cache_pool:
-                        adapter: cache.adapter.redis
-                        tags: true
+                        adapter: cache.adapter.redis_tag_aware
 
     .. code-block:: xml