bump mongodb version in CI (#7272)

* bump mongodb version

* improved wording in changelog

* another mongodb bump

* rewording changelog

* added info to option docs

src/Options/Definitions.js

@@ -778,7 +778,7 @@ module.exports.DatabaseOptions = {
   enableSchemaHooks: {
     env: 'PARSE_SERVER_DATABASE_ENABLE_SCHEMA_HOOKS',
     help:
-      'Enables database hooks to update single schema cache. Set to true if using multiple Parse Servers instances connected to the same database.',
+      'Enables database real-time hooks to update single schema cache. Set to `true` if using multiple Parse Servers instances connected to the same database. Failing to do so will cause a schema change to not propagate to all instances and re-syncing will only happen when the instances restart. To use this feature with MongoDB, a replica set cluster with [change stream](https://docs.mongodb.com/manual/changeStreams/#availability) support is required.',
     action: parsers.booleanParser,
     default: false,
   },