(bugfix) make compatible with fish version >=3.3

- cleanup
- minor comments and fixes

fish/theme-t31m/functions/envAWS.fish

@@ -4,6 +4,7 @@
 set AWS_IAM_USER ""
 
 # TODO setup your aws-mfa credential keys in the credentials file
+# TODO replace "Administrator" Role with the actual role you want to assume.
 
 # AWS Account details
 set DEV_ACCOUNT_ID ""
@@ -11,6 +12,7 @@ set STG_ACCOUNT_ID ""
 set PROD_ACCOUNT_ID ""
 set OPS_ACCOUNT_ID ""
 
+# Update if different regions are used in your setup
 export AWS_REGION=eu-west-1
 export AWS_DEFAULT_REGION=eu-west-1