Add the MongoDB Flex changes to the 2024-01-09 GitHub release changelog (#242)

Author: joaopalet

CHANGELOG.md

@@ -14,6 +14,9 @@
   - `PartialUpdateInstance` can be used to update the instance's name
   - `InstanceParameters` has a new setting `MaxDiskThreshold`
   - `ListMetricsResponse` has new fields regarding ephemeral disk
+- `mongodbflex`: [v0.10.0](services/mongodbflex/CHANGELOG.md#v0100-2024-01-05)
+  - Added method `ListMetrics` (which accepts the desired metric: `cpu`, `database`, `disk-iops`, `disk-use`, or `exec-time`) as an argument and replaces `ListCPUMetrics`, `ListDatabaseStorageMetrics`, `ListDiskIOPSMetrics`, `ListDiskUsageMetrics`, and `ListExecutionTimesMetrics`, respectivelly
+  - Removes the previously deprecated method `GetStorage`, replaced by `ListStorages`
 - `opensearch`: [v0.9.0](services/opensearch/CHANGELOG.md#v090-2024-01-09)
   - `PartialUpdateInstance` can be used to update the instance's name
   - `InstanceParameters` has a new setting `MaxDiskThreshold`