Update copyrights on AWS source code.
commit cbb449f6 Author: Morris Estepa estepamo@amazon.com Date: Wed Apr 06 2022 10:27:34 GMT-0500 (Central Daylight Time)
Additional copyright updates.
commit 98613320 Author: Morris Estepa estepamo@amazon.com Date: Tue Apr 05 2022 10:29:06 GMT-0500 (Central Daylight Time)
add copyright messages.