add msk location to s3 storage (#42)

Author: shubinmi

docs/resources/gcore_storage_s3.md

@@ -33,7 +33,7 @@ resource "gcore_storage_s3" "example_s3" {
 
 ### Required
 
-- **location** (String) A location of new storage resource. One of (s-ed1, s-darz1, s-ws1)
+- **location** (String) A location of new storage resource. One of (s-ed1, s-darz1, s-ws1, s-dt2)
 - **name** (String) A name of new storage resource.
 
 ### Optional

gcore/resource_gcore_storage_s3.go

@@ -61,15 +61,15 @@ func resourceStorageS3() *schema.Resource {
 				ForceNew: true,
 				ValidateDiagFunc: func(v interface{}, path cty.Path) diag.Diagnostics {
 					val := v.(string)
-					allowed := []string{"s-ed1", "s-darz1", "s-ws1"}
+					allowed := []string{"s-ed1", "s-darz1", "s-ws1", "s-dt2"}
 					for _, el := range allowed {
 						if el == val {
 							return nil
 						}
 					}
 					return diag.Errorf(`must be one of %+v`, allowed)
 				},
-				Description: "A location of new storage resource. One of (s-ed1, s-darz1, s-ws1)",
+				Description: "A location of new storage resource. One of (s-ed1, s-darz1, s-ws1, s-dt2)",
 			},
 			StorageS3SchemaGenerateAccessKey: {
 				Type:        schema.TypeString,