(DOCSP-37268) Create and apply source constant for accepted FCV parameters. (#130)

[JIRA](https://jira.mongodb.org/browse/DOCSP-37268)
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[Staging](https://preview-mongodblmkerbeymdb.gatsbyjs.io/ops-manager/DOCSP-37268/reference/cluster-configuration/#mongodb-instances)

Author: lmkerbey-mdb

snooty.toml

@@ -75,6 +75,7 @@ bagent-version-cloud = "7.6.0.1059"
 bagent-version-opsmgr = "6.8.6.1013"
 c2c-version = "6.0.8"
 cloudmgr-url = "cloud.mongodb.com"
+fcv-list = "**5.0**, **6.0**, and **7.0**"
 service = "Atlas"
 service-long = "MongoDB Atlas"
 magent = "Monitoring"

source/includes/api/automation-configuration/processes.rst

@@ -169,8 +169,7 @@ instances. Using this array, you can:
        earlier or later than the **featureCompatibilityVersion** you
        choose.
 
-       - |mms| accepts **3.2**, **3.6**, **4.0** and
-         **4.2** as parameter values. If you have an
+       - |mms| accepts {+fcv-list+} as parameter values. If you have an
          existing deployment, |mms| only accepts a
          **featureCompatibilityVersion** equal to or one release older
          than the MongoDB version you deployed. To learn which of