fix: no more mention of the .io

Author: CMCDragonkai

.env.example

@@ -12,7 +12,8 @@ NODE_ENV=development
 
 # If set, indicates that `PK_TEST_COMMAND` is targetting docker
 # PK_TEST_COMMAND_DOCKER=
-# Accessing AWS for testnet.polykey.io and mainnet.polykey.io deployment
+
+# Accessing AWS
 AWS_DEFAULT_REGION='ap-southeast-2'
 AWS_ACCESS_KEY_ID=
 AWS_SECRET_ACCESS_KEY=