Update multi-db docs

As of Rails 7+ we added an option to support loading the schema cache
for multiple databases.

Author: eileencodes

guides/source/active_record_multiple_databases.md

@@ -33,7 +33,6 @@ The following features are not (yet) supported:
 
 * Automatic swapping for horizontal sharding
 * Load balancing replicas
-* Dumping schema caches for multiple databases
 
 ## Setting up your application
 
@@ -549,6 +548,10 @@ order from one table cannot be applied to another table.
 Rails can't guess this for you because association loading is lazy, to load `treats` in `@dog.treats`
 Rails already needs to know what SQL should be generated.
 
+### Schema Caching
+
+If you want to load a schema cache for each database you must set a `schema_cache_path` in each database configuration and set `config.active_record.lazily_load_schema_cache = true` in your application configuration. Note that this will lazily load the cache when the database connections are established.
+
 ## Caveats
 
 ### Automatic swapping for horizontal sharding
@@ -563,9 +566,3 @@ Rails also doesn't support automatic load balancing of replicas. This is very
 dependent on your infrastructure. We may implement basic, primitive load balancing
 in the future, but for an application at scale this should be something your application
 handles outside of Rails.
-
-### Schema Cache
-
-If you use a schema cache and multiple databases, you'll need to write an initializer
-that loads the schema cache from your app. This wasn't an issue we could resolve in
-time for Rails 6.0 but hope to have it in a future version soon.