Merge docs modification

Squashed commit of the following

commit b7c87eb9 Author: fabien houeto fhoueto@amazon.com Date: Sun Mar 05 2023 12:55:24 GMT-0500 (Eastern Standard Time)

address comment on missing location word

commit 8c8c4124 Author: fhoueto.amz fhoueto@amazon.com Date: Tue Feb 28 2023 08:23:43 GMT-0500 (Eastern Standard Time)

Add AWS_REGION environment varaible explanation to readme.