doc: Adds upgrade guide for MongoDB Atlas Provider 1.30.0 (#3188)

* docs: Add upgrade guide for MongoDB Atlas Provider 1.30.0

* doc: Adds AWS MSK to upgrade guide

* doc: Apply suggestions

* Update docs/guides/1.30.0-upgrade-guide.md

Co-authored-by: davidhou17 <[email protected]>

---------

Co-authored-by: davidhou17 <[email protected]>

Author: EspenAlbert

docs/guides/1.30.0-upgrade-guide.md

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+---
+page_title: "Upgrade Guide 1.30.0"
+---
+
+# MongoDB Atlas Provider 1.30.0: Upgrade and Information Guide
+
+The Terraform MongoDB Atlas Provider version 1.30.0 has a number of new and exciting features.
+
+## New Resources, Data Sources, and Features
+
+- You can now use `Https` connections with the `mongodbatlas_stream_connection` resource. To learn more, see the [mongodbatlas_stream_connection](https://registry.terraform.io/providers/mongodb/mongodbatlas/latest/docs/resources/stream_connection) resource documentation.
+
+- `mongodbatlas_stream_privatelink_endpoint` now supports [Amazon Managed Streaming for Apache Kafka](https://aws.amazon.com/msk/) (AWS MSK). New `error_message`, `interface_endpoint_name`, and `provider_account_id` attributes have also been added. To learn more, see the [mongodbatlas_stream_privatelink_endpoint](https://registry.terraform.io/providers/mongodb/mongodbatlas/latest/docs/resources/stream_privatelink_endpoint) resource documentation.
+
+- `mongodbatlas_cloud_backup_snapshot` now supports `timeouts` attribute for the create operation.
+
+1.30.0 also includes general improvements, bug fixes, and several key documentation updates. See the [CHANGELOG](https://github.com/mongodb/terraform-provider-mongodbatlas/blob/master/CHANGELOG.md) for more information.
+
+## Helpful Links
+
+* [Report bugs](https://github.com/mongodb/terraform-provider-mongodbatlas/issues)
+
+* [Request Features](https://feedback.mongodb.com/forums/924145-atlas?category_id=370723)
+
+* [Contact Support](https://docs.atlas.mongodb.com/support/) covered by MongoDB Atlas support plans, Developer and above.