docs: be more specific about current Angular's rerender behavior (#1213)

Author: shaman-apprentice

docs/angular-testing-library/api.mdx

@@ -411,8 +411,8 @@ expect(screen.getByTestId('name-value').textContent).toBe('Sarah')
 
 ### `rerender`
 
-Re-render the same component with different props. Input properties that are not
-defined are cleared. This calls `detectChanges` after the props are updated.
+Create and render a new instance of the component. Input properties that are not
+defined are cleared. To keep them use [change](#change).
 
 ```typescript
 const {rerender} = await render(Counter, {