chore: Updates CHANGELOG.md for #2891

Author: svc-apix-Bot

CHANGELOG.md

@@ -13,6 +13,8 @@ ENHANCEMENTS:
 * data-source/mongodbatlas_cluster: Adds `pinned_fcv` attribute ([#2817](https://github.com/mongodb/terraform-provider-mongodbatlas/pull/2817))
 * data-source/mongodbatlas_clusters: Adds `pinned_fcv` attribute ([#2817](https://github.com/mongodb/terraform-provider-mongodbatlas/pull/2817))
 * resource/mongodbatlas_advanced_cluster: Adds `pinned_fcv` attribute ([#2789](https://github.com/mongodb/terraform-provider-mongodbatlas/pull/2789))
+* resource/mongodbatlas_advanced_cluster: Adjusts create operation to support cluster tier auto scaling per shard. ([#2836](https://github.com/mongodb/terraform-provider-mongodbatlas/pull/2836))
+* resource/mongodbatlas_advanced_cluster: Adjusts update operation to support cluster tier auto scaling per shard. ([#2814](https://github.com/mongodb/terraform-provider-mongodbatlas/pull/2814))
 * resource/mongodbatlas_cluster: Adds `pinned_fcv` attribute ([#2817](https://github.com/mongodb/terraform-provider-mongodbatlas/pull/2817))
 
 BUG FIXES: