Update evaluator.py

kyu_8/greek_sort/evaluator.py:10 in public function `evaluator`:
        D401: First line should be in imperative mood (perhaps 'Evaluate', not 'evaluator')

        [Docstring] prescribes the function or method's effect as a command:
        ("Do this", "Return that"), not as a description; e.g. don't write
        "Returns the pathname ...".

kyu_8/greek_sort/evaluator.py

@@ -8,7 +8,7 @@
 
 def evaluator(result: int, expected: str) -> bool:
     """
-    'evaluator' function.
+    Comparator for a list of phonetic words.
 
     :param result: int
     :param expected: str