frontend-test-utils: remove redundant .factory util

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

docs/frontend-system/utility-apis/05-testing.md

@@ -9,7 +9,7 @@ When testing frontend components and extensions, you often need to provide mock
 
 ## The `mockApis` namespace
 
-The `mockApis` namespace is the main entry point for creating mock utility API instances in tests. It provides three usage patterns for each API:
+The `mockApis` namespace is the main entry point for creating mock utility API instances in tests. It provides two usage patterns for each API:
 
 ### Fake instances
 
@@ -42,10 +42,6 @@ const catalogApi = mockApis.permission.mock({
 expect(catalogApi.authorize).toHaveBeenCalledTimes(1);
 ```
 
-### API factories
-
-Call `.factory()` to get an `ApiFactory` suitable for more advanced wiring scenarios.
-
 ## Providing mock APIs in tests
 
 ### With `renderInTestApp`