donate: remove duplicate test suite example (tpo/web/donate-neo#79)

service/donate.md

@@ -867,10 +867,6 @@ Also note that the CiviCRM side of things has its own metrics, see the
 
 ## Tests
 
-The `pytest` test suite can be run by entering a `poetry shell` and running:
-
-    coverage run manage.py test
-
 To test donations after upgrades or to confirm everything works, see
 the [Testing the donation site](#testing-the-donation-site) section.
 
@@ -878,7 +874,7 @@ The site's test suite is ran in GitLab CI when a merge request is
 sent, and a full review app is setup to test the site before the
 branch is merged. Then staging must be tested as well.
 
-Tests can be ran locally:
+The `pytest` test suite can be run by entering a `poetry shell` and running:
 
     coverage run manage.py test