Update docs/basic/activity_testing.md

Co-authored-by: Yennifer Santos <46519584+ydaponte@users.noreply.github.com>

docs/basic/activity_testing.md

@@ -57,7 +57,7 @@ Let's write a test for validating correct evaluation of the `url` property.
 
 ## Arrange
 
-Get a reference to the activity you want to test using the `get_activity_by_name` method on the `Pipeline` instance.
+Get a reference to the activity to be tested using the `get_activity_by_name` method on the `Pipeline` instance.
 
 ```python
 pipeline = test_framework.repository.get_pipeline_by_name("trigger_job_pipeline")