Merge pull request awslabs#182 from EdwardBetts/patch-1

correct spelling mistake

Author: joguSD

awsshell/index/__init__.py

@@ -61,7 +61,7 @@
 
 .. code-block:: python
 
-  # Default useage:
+  # Default usage:
 
   loader = CompletionIndex()
   # Load based on the current CLI version you have installed