Apply suggestions from code review

Co-authored-by: Marek Nocoń <[email protected]>

Author: dabrt

docs/getting_started/requirements.md

@@ -214,8 +214,6 @@ For production setups it's recommended that you use Varnish/Fastly, Redis, NFS/E
 
     - For content search, Solr 8.11.1 or higher.
     Alternatively, Elasticsearch 7.16.2 or higher 7.x version.
-    - The above solutions require Oracle Java/Open JDK. The minimum requirement is 8 LTS, recommended 11 LTS.
-    Newer versions aren't supported.
 
 === "[[= product_name =]] v4.6"
 

docs/infrastructure_and_maintenance/cache/persistence_cache.md

@@ -212,7 +212,7 @@ Several cloud providers have managed services that are easier to set up, handle
 
 ## Using cache service
 
-Using the internal cache service allows you to use an interface and without caring whether the system is configured to place the cache on File system.
+Using the internal cache service allows you to use an interface and without caring whether the system is configured to place the cache in Redis or on File system.
 And as [[= product_name =]] requires that instances use a cluster-aware cache in cluster setup, you can safely assume your cache is shared *(and invalidated)* across all web servers.
 
 !!! note