Add extra highlight line for mock service injection snippet

Author: jonorogers

aspnetcore/test/integration-tests.md

@@ -303,7 +303,7 @@ To test the service and quote injection in an integration test, a mock service i
 :::zone-end
 :::zone pivot="nunit"
 
-:::code language="csharp" source="integration-tests/snippets/nunit/IntegrationTests/IndexPageTests.cs" id="snippet5" highlight="7-10,17,20-21":::
+:::code language="csharp" source="integration-tests/snippets/nunit/IntegrationTests/IndexPageTests.cs" id="snippet5" highlight="7-10,17,20-22":::
 
 :::zone-end
 

aspnetcore/test/integration-tests/includes/integration-tests9.md

@@ -306,7 +306,7 @@ To test the service and quote injection in an integration test, a mock service i
 :::zone-end
 :::zone pivot="nunit"
 
-:::code language="csharp" source="../snippets/nunit/IntegrationTests/IndexPageTests.cs" id="snippet5" highlight="7-10,17,20-21":::
+:::code language="csharp" source="../snippets/nunit/IntegrationTests/IndexPageTests.cs" id="snippet5" highlight="7-10,17,20-22":::
 
 :::zone-end