Update index.mdx (#7840)

Author: takaya-okamoto

src/pages/[platform]/start/account-setup/index.mdx

@@ -228,7 +228,7 @@ aws configure sso
 
 | SSO session name (Recommended): amplify-admin
 | SSO start URL: <START SESSION URL>
-| SSO region: <YOUR START SESSION URL>
+| SSO region: <your-region>
 | SSO registration scopes [sso:account:access]: <leave blank>
 | Attempting to automatically open the SSO authorization page in your default browser.
 | If the browser does not open or you wish to use a different device to authorize this request, open the following URL: