Add a comment about the low character value test

Author: adamtheturtle

tests/mock_vws/test_add_target.py

@@ -209,7 +209,10 @@ class TestTargetName:
         'name',
         [
             'á',
-            chr(_MAX_CHAR_VALUE),
+            # We test just below the max character value.
+            # This is because targets with the max character value in their
+            # names get stuck in the processing stage.
+            chr(_MAX_CHAR_VALUE - 2),
             'a' * 64,
         ],
         ids=['Short name', 'Max char value', 'Long name'],