added commect to explain what the script does

utils/format_dates.py

@@ -1,6 +1,11 @@
 #!/usr/bin/env python3
 # -*- coding: utf8 -*-
 
+"""
+Helper script that normalizes all existing date entries in the DB's "Werk" table to the format "YYYY[-MM[-DD]]". 
+"""
+
+
 from flask import Flask
 from dotenv import load_dotenv
 import os