refactor: address PR reviews

Author: mariajgrimaldi

Diff for: openedx_filters/filters.py

@@ -30,6 +30,7 @@ def run_filter(self, user, course_key, mode):
                     "course_key": course_key,
                     "mode": "no-id-professional",
                 }
+
     Another version would be:
 
     >>> class MyFilterStep(PipelineStep):

Diff for: openedx_filters/learning/filters.py

@@ -675,7 +675,7 @@ def __init__(
             Initialize the exception with the message and the template to render instead.
 
             Arguments:
-                message (Str): error message for the exception.
+                message (str): error message for the exception.
                 course_about_template (str): template path rendered instead.
                 template_context (dict): context used to the new course_about_template.
             """