Update CHANGELOG.md

CHANGELOG.md

@@ -15,14 +15,14 @@ OpenNMT-tf follows [semantic versioning 2.0.0](https://semver.org/). The API cov
 
 * Update to TensorFlow 2.1<br/>OpenNMT-tf now depends on the `tensorflow` pip package instead of `tensorflow-gpu`. The `tensorflow` package now includes GPU support by default. If you are upgrading an existing environment, we recommend uninstalling the `tensorflow-gpu` package before doing so.
 * Update to TensorFlow Addons 0.7 with Windows support
-* Data parameter `export_vocabulary_assets` to embed word vocabularies in the graph itself
+* Data parameter `export_vocabulary_assets` to control whether vocabularies are exported as file assets or embedded in the graph itself
 
 ### Fixes and improvements
 
 * Fix error when reading loss returned by a sequence classifier model
 * Fix error on sequences of length 1 in the sequence tagger with CRF
-* Rollback to export vocabularies as file assets
-* Remove some synchronization points when training multiple replicas
+* Export vocabularies as file assets by default
+* Remove an unnecessary synchronization when training multiple replicas
 * Internal cleanup to fully remove Python 2 support
 
 ## [2.4.0](https://github.com/OpenNMT/OpenNMT-tf/releases/tag/v2.4.0) (2019-12-10)