DOCSP-6090: [Atlas] Live Migration: Rename the 'Start Cutover' and 'I'm Done' buttons (#130)

Author: steveren

source/images/compose-add-ips.png

@@ -73,9 +73,8 @@ content: |
   On your Compose deployment dashboard, click the :guilabel:`Security`
   link in the left-side navigation. The :guilabel:`Whitelist TCP/HTTP
   IPs` section displays a list of IP address ranges which are allowed
-  to access your Compose deployment. Add all four of the IP
-  address ranges which are listed at the top of the Atlas Migration
-  process dialog window. 
+  to access your Compose deployment. Add the IP address range which is
+  listed at the top of the Atlas Migration process dialog window.
 
   .. figure:: /images/compose-add-ips.png
      :figwidth: 700px
@@ -147,7 +146,7 @@ content: |
   .. figure:: /images/migration-complete.png
      :figwidth: 700px
 ---
-title: Start your cutover
+title: Prepare to Start your cutover
 ref: start-cutover
 level: 4
 stepnum: 12
@@ -156,7 +155,7 @@ content: |
   Atlas will maintain this synchronized state for 72 hours. If you
   need more time, syncing can be extended for another 24 hours.
 
-  Click the green :guilabel:`Start cutover` button and follow the
+  Click the green :guilabel:`Prepare to Cutover` button and follow the
   instructions listed in the dialog window.
 
   Once the cutover is complete, you can update your

source/includes/steps-migrate-compose.yaml

@@ -99,13 +99,11 @@ content: |
 
    A countdown timer in a progress bar indicates how much time remains
    before your target cluster is ready to migrate data from your source
-   cluster. Wait until the countdown timer and the :guilabel:`Start Cutover`
+   cluster. Wait until the countdown timer and the :guilabel:`Prepare to Cutover`
    button are green before proceeding to the next step.
 
-   .. figure:: /images/migration-complete.png
-      :figwidth: 700px
 ---
-title: Click :guilabel:`Start Cutover`.
+title: Click :guilabel:`Prepare to Cutover`.
 ref: start-cutover
 stepnum: 7
 content: |