manual mocks do not automatically take precedence over modules unless automock is true (jestjs#5710)

Author: antialias

docs/ManualMocks.md

@@ -53,8 +53,9 @@ accordingly.
 ```
 
 When a manual mock exists for a given module, Jest's module system will use that
-module when explicitly calling `jest.mock('moduleName')`. However, manual mocks
-will take precedence over node modules even if `jest.mock('moduleName')` is not
+module when explicitly calling `jest.mock('moduleName')`. However, when
+`automock` is set to `true`, the manual mock implementation will be used instead
+of the automatically created mock, even if `jest.mock('moduleName')` is not
 called. To opt out of this behavior you will need to explicitly call
 `jest.unmock('moduleName')` in tests that should use the actual module
 implementation.