DOCSP-46925 -- fix accepted values snapshot daily retention days API param (#793)

- [DOCSP-number](https://jira.mongodb.org/browse/DOCSP-46925)
-
[STAGING](https://deploy-preview-793--docs-ops-manager.netlify.app/reference/api/backup/update-one-snapshot-schedule-by-cluster-id/#request-body-parameters)

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Author: jvincent-mongodb

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

@@ -25,8 +25,9 @@
    * - ``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``.
 
        Setting ``dailySnapshotRetentionDays`` to ``0`` disables this
        rule.