Update support ticket creation instructions

Added instructions for signing in with .ghe accounts.

Author: adamrr724

content/support/contacting-github-support/creating-a-support-ticket.md

@@ -83,6 +83,10 @@ Especially for tickets with {% data variables.product.support_ticket_priority_ur
 1. Navigate to the {% data variables.contact.contact_landing_page_portal %} and choose one of the following options:
 
    * To sign in with your {% data variables.product.github %} account, click **Sign in with {% data variables.product.github %}**.
+   * If your organization uses Data Residency or Enterprise Managed Users (accounts ending in `.ghe`):
+      1. In the sign-in dialog, click **Sign in to your .ghe account**.
+      1. Enter your enterprise or tenant name (provided by your administrator) and continue.
+      1. Complete the SAML authentication process as prompted. This will sign you in to your .ghe enterprise-managed account.
    * To sign up for {% data variables.product.github %}, click **Sign up for {% data variables.product.github %}**.
    * If you can't sign in or sign up, click **Can't sign in?** and fill out the form. You will be guided through an email verification process.{% ifversion ghec or ghes %} You will need to upload your {% data variables.product.prodname_enterprise %} license. For more information, see [AUTOTITLE](/billing/managing-your-license-for-github-enterprise/downloading-your-license-for-github-enterprise).{% endif %}