add info re system-required password change

Author: genwhittTTD

docs/portal/portal-getting-started.md

@@ -133,4 +133,14 @@ If you forget your password, just click the **Forgot Password** link on the logi
 When you've finished updating your account, remember to log out.
 
 1. At the top right, click your name.
-1. From the drop-down list, click **Log Out**.
+1. From the drop-down list, click **Log Out**.
+
+## Password Change Requirement
+
+In some cases, you might be required to change your password. For example, if the password requirements change and your current password doesn't meet the new requirements, or password expiration is in effect, you'll need to choose a new password.
+
+If this occurs, when you're logging in you'll see an **Update Password** page.
+
+The current password requirements are displayed on the page. Choose a new password, type it again to confirm, and save.
+
+Be sure to choose a password you'll remember.

docs/portal/portal-overview.md

@@ -22,6 +22,7 @@ The UID2 Portal is your one-stop shop for setting up and configuring your UID2 a
 | Add team members who will have permission to manage your account. | [Team Members](team-members.md) |
 | Set up designated email contacts who will be notified of news or updates. | [Email Contacts](email-contacts.md) |
 | View a detailed log of all past actions performed by, or on behalf of, the current participant. | [Audit Trail](audit-trail.md) |
+| Change password when required by the Portal. | [Password Change Requirement](portal-getting-started.md#password-change-requirement) |
 
 ## Access the UID2 Portal