add consistent docs to master and 6th version

docs/6/performance/query-caching.md

@@ -15,6 +15,14 @@ Lighthouse supports Automatic Persisted Queries (APQ), compatible with the
 
 APQ is enabled by default, but depends on query caching being enabled.
 
+## Query validation caching
+
+Lighthouse can cache the result of the query validation process as well. It only caches queries without errors.
+`QueryComplexity` validation can not be cached as it is dependent on the query, so it is always executed.
+
+Query validation caching is disabled by default. You can enable it by setting `validation_cache.enable` to `true` in the
+configuration in `config/lighthouse.php`.
+
 ## Testing caveats
 
 If you are mocking Laravel cache classes like `\Illuminate\Support\Facades\Cache` or `\Illuminate\Cache\Repository` and asserting expectations in your unit tests, it might be best to disable the query cache in your `phpunit.xml`:

docs/master/security/validation.md

@@ -314,12 +314,12 @@ By default, Lighthouse enables all default query validation rules from `webonyx/
 This covers fundamental checks, e.g. queried fields match the schema, variables have values of the correct type.
 
 If you want to add custom rules or change which ones are used, you can bind a custom implementation
-of the interface `\Nuwave\Lighthouse\Support\Contracts\ProvidesValidationRules` through a service provider.
+of the interface `\Nuwave\Lighthouse\Support\Contracts\ProvidesCacheableValidationRules` through a service provider.
 
 ```php
 use Nuwave\Lighthouse\Support\Contracts\ProvidesValidationRules;
 
-final class MyCustomRulesProvider implements ProvidesValidationRules {}
+final class MyCustomRulesProvider implements ProvidesCacheableValidationRules {}
 
-$this->app->bind(ProvidesValidationRules::class, MyCustomRulesProvider::class);
+$this->app->bind(ProvidesCacheableValidationRules::class, MyCustomRulesProvider::class);
 ```