Update compute_ranks.py

kyu_5/sports_league_table_ranking/compute_ranks.py:102 in public function `calc_team_points`:
        D401: First line should be in imperative mood (perhaps 'Calculate', not 'Calculates')

        [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_5/sports_league_table_ranking/compute_ranks.py

@@ -100,7 +100,7 @@ def check_if_team_registered(team, teams, number) -> None:
 
 def calc_team_points(team, teams, score_a, score_b) -> None:
     """
-    Calculates team points.
+    Calculate team points.
 
     :param team:
     :param teams: