Fix spelling typos

backport commit 659ffaddb4

modules/python/test/test_algorithm_rw.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-"""Algorithm serializaion test."""
+"""Algorithm serialization test."""
 import tempfile
 import os
 import cv2 as cv

modules/python/test/test_persistence.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-""""Core serializaion tests."""
+""""Core serialization tests."""
 import tempfile
 import os
 import cv2 as cv