Add a period at the end of the comment

Author: lainq

src/arguments/utility.py

@@ -45,7 +45,7 @@ def __init__(self):
 
     @property
     def playbook_path(self):
-        """Create an environment variable 'DYNAMIC containing the path of dynamic_playbook.json and returns i"""
+        """Create an environment variable 'DYNAMIC containing the path of dynamic_playbook.json and returns i."""
         if not os.getenv(self.key):
             if(sys.platform=='linux'):
                 os.environ[self.key] = os.path.\