docs: add Workflow transition TypeInfo changelog entry

Author: THardy98

CHANGELOG.md

@@ -22,6 +22,7 @@ to docs, or any other relevant information.
 ### Added
 
 - **Experimental**: Workflow Clients can now use `TypeInfo` to encode Workflow inputs and decode Workflow results.
+- **Experimental**: Workflows can now use `TypeInfo` for Child Workflow inputs and results and continue-as-new inputs.
 
 ### Changed