upgrade guide (#2917)

Author: maastha

docs/guides/1.24.0-upgrade-guide.md

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+---
+page_title: "Upgrade Guide 1.24.0"
+---
+
+# MongoDB Atlas Provider 1.24.0: Upgrade and Information Guide
+
+The Terraform MongoDB Atlas Provider version 1.24.0 has a number of new and exciting features.
+
+## New Resources, Data Sources, and Features
+
+- You can now specify TLS cipher suite configuration in `mongodbatlas_advanced_cluster` and `mongodbatlas_cluster` using `advanced_configuration.0.tls_cipher_config_mode` and `advanced_configuration.0.custom_openssl_cipher_config_tls12`. This allows you to specify custom cipher suites for TLS 1.2. To learn more, see either [mongodbatlas_advanced_cluster](https://registry.terraform.io/providers/mongodb/mongodbatlas/latest/docs/resources/advanced_cluster) or [mongodbatlas_cluster](https://registry.terraform.io/providers/mongodb/mongodbatlas/latest/docs/resources/cluster) resource documentation.
+
+
+## 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.