Fix wrong entries in changelog

Author: dargilco

sdk/ai/azure-ai-projects/CHANGELOG.md

@@ -19,8 +19,6 @@ Breaking changes in beta operations:
 * Required property `isolation_key_source` removed from class `EntraAuthorizationScheme`.
 * Required keyword argument `isolation_key` removed from `.beta.agents.create_session()` and `.beta.agents.delete_session()` methods.
 * Argument `body` in methods `.beta.evaluation_taxonomies.create()` and `.beta.evaluation_taxonomies.update()` renamed to `taxonomy`.
-* Removed enum value `DataGenerationJobType.TASK`.
-* Removed model `TaskDataGenerationJobOptions`.
 
 ### Bugs Fixed