add link to AWS docs

Author: mletalie

rosa_planning/rosa-cloud-expert-prereq-checklist.adoc

@@ -59,6 +59,7 @@ Ensure that you have the following accounts, credentials, and permissions.
 //OSDOCS-11789: Moving these here because it is a permission / account level enablement
 * Enable ROSA for your AWS account on the link:https://console.aws.amazon.com/rosa/[AWS console].
 ** If your account is the management account for your organization (used for AWS billing purposes), you must have `aws-marketplace:Subscribe` permissions available on your account. See _Service control policy (SCP) prerequisites_ for more information, or see the AWS documentation for troubleshooting: link:https://docs.aws.amazon.com/rosa/latest/userguide/security-iam-troubleshoot.html#error-aws-orgs-scp-denies-permissions[AWS Organizations service control policy denies required AWS Marketplace permissions].
+* Ensure you have not enabled restrictive tag policies. For more information, see link:https://docs.aws.amazon.com/organizations/latest/userguide/orgs_manage_policies_tag-policies.html[Tag policies] in the AWS documentation.
 
 === Red{nbsp}Hat account
 
@@ -106,7 +107,7 @@ endif::openshift-rosa[]
 ----
 $ rosa login
 To login to your Red Hat account, get an offline access token at https://console.redhat.com/openshift/token/rosa
-? Copy the token and paste it here: 
+? Copy the token and paste it here:
 ----
 +
 Alternatively, you can copy the full `$ rosa login --token=abc...` command and paste that in the terminal: