Update to migrate description and added back evacuate

bug: #1022653

Change-Id: Ia61fec61265f8edd731a471a858fac7ffd0e8f4d
author: diane fleming
Update Developer Guide titles to Specifications

bug: #1178388

Change-Id: Ic5c566a5a840f8fabd122d7035efe82270dcaaec
author: Diane Fleming
Added information about migration types and billing

bug: #1022653

Change-Id: I39b4f4f628d96d25f563327beb324bf551e0c8e2
author: Diane Fleming
Merge "Update Developer Guide titles to Specifications"