Update cli/README.md

Co-Authored-By: hfaulds <[email protected]>

cli/README.md

@@ -37,7 +37,7 @@ action "Publish" {
 
 All environment variables listed in [the official documentation](https://docs.aws.amazon.com/cli/latest/userguide/cli-environment.html) are supported.
 
-We provide defaults for some of following, these may also be overridden:
+The most common environment variables are:
 
 - `AWS_DEFAULT_REGION`- **Optional** The AWS region name, defaults to `us-east-1` ([more info](https://docs.aws.amazon.com/general/latest/gr/rande.html))
 - `AWS_DEFAULT_OUTPUT`- **Optional** The CLI's output output format, defaults to `json` ([more info](https://docs.aws.amazon.com/cli/latest/userguide/cli-environment.html))