Backport DOCS-16696 to v7.0 (#157) (#175)

https://workerpool-boxgs.mongodbstitch.com/pages/job.html?collName=queue&jobId=66170c473a5920a291027320

Author: davidhou17

source/core/requirements.txt

@@ -50,18 +50,17 @@ for all |onprem| components that it serves:
 .. example::
 
    You want to serve both the |onprem| application and a
-   :opsmgr:`Backup Daemon </reference/glossary/#std-term-backup-daemon>` on one host. This |onprem| configuration will
-   manage and monitor 300 MongoDB hosts and back up 200 hosts. The
-   total disk capacity of all databases being backed up is 4 TB. The
-   total requirements would be:
+   :opsmgr:`Backup Daemon </reference/glossary/#std-term-backup-daemon>` on one host. 
+   This |onprem| configuration will manage and monitor 300 MongoDB hosts,
+   back up 200 hosts, and run FCV 4.2 or later. The
+   total disk capacity of all databases being backed up is 4 TB. 
+   The total requirements would be:
 
    - |onprem| application needs 15 GB of RAM.
-   - The Backup Daemon also needs:
+   - The Backup Daemon also needs at least 100 GB 
+     of available disk capacity.
 
-     - 15 GB of RAM and
-     - 2.5 times the 4 TB of backed up databases in disk capacity.
-
-   This example host would require a minimum of 30 GB of RAM and 10 TB
+   This example host would require a minimum of 15 GB of RAM and 100 GB
    of disk capacity.
 
 .. include:: /includes/admonitions/warning-follow-requirements.rst