added doc comments to all formatters

html_to_django/formatters/include_formatter.py

@@ -1,3 +1,16 @@
+"""
+include_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-include". The value of "dj-include" is expected to be a
+string representing a Django template include command. For each found element, it replaces the element's content with
+the Django template include command, using the value of "dj-include" as the command.
+Then it removes the "dj-include" attribute from the element.
+
+Example:
+    If an element is <div dj-include="template_name.html"></div>,
+    after processing, it becomes {% include "template_name.html" %}.
+"""
 from bs4 import BeautifulSoup