Update adding-organizations-to-your-enterprise-account.md (#4294)

* Update adding-organizations-to-your-enterprise-account.md

The existing verbiage creates an absolute when noting "You cannot transfer existing organizations into an enterprise account on your end."  This is incorrect as Sales Operations has a process that they can use to assist with transfers as long as the organization is verified to be owned by the same customer. The updated tidbit provides more clarity and accuracy.

* Update adding-organizations-to-your-enterprise-account.md

As it will end up directly with a Sales representative anyway I am updating the verbiage i originally submitted.

* Update content/github/setting-up-and-managing-your-enterprise/adding-organizations-to-your-enterprise-account.md

Co-authored-by: hubwriter <hubwriter@github.com>

Author: highfi13g

content/github/setting-up-and-managing-your-enterprise/adding-organizations-to-your-enterprise-account.md

@@ -13,7 +13,7 @@ topics:
 
 Enterprise owners can create new organizations within an enterprise account's settings.
 
-To add an organization to your enterprise account, you must create the organization from within the enterprise account settings. You cannot transfer existing organizations into an enterprise account.
+To add an organization to your enterprise account, you must create the organization from within the enterprise account settings. If you want to transfer an existing organization to your enterprise account, contact your {% data variables.product.prodname_dotcom %} sales account representative.
 
 ### Creating an organization in your enterprise account