style: Fix some quality issues.

Author: feanil

backend/manage.py

@@ -18,7 +18,7 @@
         # issue is really that Django is missing to avoid masking other
         # exceptions on Python 2.
         try:
-            import django  # pylint: disable=unused-import, wrong-import-position
+            import django  # pylint: disable=unused-import
         except ImportError as import_error:
             raise ImportError(
                 "Couldn't import Django. Are you sure it's installed and "

backend/sample_plugin/__init__.py

@@ -1,5 +1,5 @@
 """
-A sample backend plugin for the Open edX Platform
+A sample backend plugin for the Open edX Platform.
 """
 
 __version__ = '0.1.0'