docs: expand bubble sort explanation

sorts/bubble_sort.py

@@ -4,6 +4,11 @@
 def bubble_sort_iterative(collection: list[Any]) -> list[Any]:
     """Pure implementation of bubble sort algorithm in Python
 
+    Sort a list of numbers in ascending order using the bubble sort algorithm.
+    Bubble sort repeatedly steps through the list, compares adjacent elements,
+    and swaps them if they are in the wrong order. This process continues until
+    the list is fully sorted.
+
     :param collection: some mutable ordered collection with heterogeneous
     comparable items inside
     :return: the same collection ordered by ascending