DOCSP-46925 -- fix accepted values snapshot daily retention days API param-v6.0-backport (793) (#796)

# Backport

This will backport the following commits from `master` to `v6.0`:
- [DOCSP-46925 -- fix accepted values snapshot daily retention days API
param (#793)](10gen/docs-ops-manager#793)

<!--- Backport version: 9.6.1 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

Author: jvincent-mongodb

source/includes/api/list-tables/snapshot-schedule/requests-opsmgr.rst

@@ -27,8 +27,9 @@
    * - ``dailySnapshotRetentionDays``
      - number
      - Optional
-     - Number of days to retain daily snapshots. You can set a value
-       between ``1`` and ``365``, inclusive.
+     - Number of days to retain daily snapshots. Accepted values are: 
+       ``0``, ``3``, ``4``, ``5``, ``6``, ``7``, ``15``, ``30``, ``60``, 
+       ``90``, ``120``, ``180``, ``360``.
 
        .. note::