add experimental tag

Author: THardy98

packages/envconfig/src/types.ts

@@ -3,6 +3,8 @@ import type { NativeConnectionOptions } from '@temporalio/worker';
 /**
  * A data source for configuration, which can be a path to a file,
  * the string contents of a file, or raw bytes.
+ * 
+ * @experimental Environment configuration is new feature and subject to change.
  */
 export type ConfigDataSource = { path: string } | { data: string | Buffer };