DOCS: Remove BuildState documentation

docs/en/02_Developer_Guides/19_GraphQL/07_tips_and_tricks.md

@@ -17,16 +17,6 @@ Docs for the current stable version (3.x) can be found
 
 Often times, you'll need to know the name of the type given a class name. There's a bit of context to this.
 
-### Getting the type name at build time
-
-If you need to know the name of the type _during the build_, e.g. creating the name of an operation, field, query, etc,
-you should use the `Build::requireActiveBuild()` accessor. This will get you the schema that is currently being built,
-and throw if no build is active. A more tolerant method is `getActiveBuild()` which will return null if no schema
-is being built.
-
-```php
-Build::requireActiveBuild()->findOrMakeModel($className)->getName();
-```
 
 ### Getting the type name from within your app
 
@@ -34,20 +24,7 @@ If you need the type name during normal execution of your app, e.g. to display i
 on the cached typenames, which are persisted alongside your generated schema code.
 
 ```php
-Schema::create('default')->getTypeNameForClass($className);
-```
-
-### Why is there a difference?
-
-It is expensive to load all of the schema config. The `getTypeNameForClass` function avoids the need to
-load the config, and reads directly from the cache. To be clear, the following is functionally equivalent,
-but slow:
-
-```php
-Schema::create('default')
-  ->loadFromConfig()
-  ->findOrMakeModel($className)
-  ->getName();
+SchemaFactory::get('default')->getTypeNameForClass($className);
 ```
 
 ## Persisting queries