Fixed typo in unit testing documentation.
There was a reference to a non-existent Unit_test::set_items method when
it should be Unit_test::set_test_items.
diff --git a/user_guide_src/source/libraries/unit_testing.rst b/user_guide_src/source/libraries/unit_testing.rst
index 03819b2..6bd91bf 100644
--- a/user_guide_src/source/libraries/unit_testing.rst
+++ b/user_guide_src/source/libraries/unit_testing.rst
@@ -131,7 +131,7 @@
- Any notes you entered for the test (notes)
You can customize which of these items get displayed by using
-$this->unit->set_items(). For example, if you only wanted the test name
+$this->unit->set_test_items(). For example, if you only wanted the test name
and the result displayed:
Customizing displayed tests