added doc comments to attr_formatter and block_formatter

html_to_django/formatters/block_formatter.py

@@ -1,3 +1,15 @@
+"""
+block_formatter.py
+
+This module contains a function `format` that modifies a BeautifulSoup object in place.
+The function searches for all elements with the attribute "dj-block". The value of "dj-block" is expected to be a
+string representing the name of a Django block. For each found element, it inserts Django block tags before and after
+the element, using the value of "dj-block" as the block name. Then it removes the "dj-block" attribute from the element.
+
+Example:
+    If an element is <div dj-block="content">Content</div>,
+    after processing, it becomes {% block content %}Content{% endblock %}.
+"""
 from bs4 import BeautifulSoup