Improve formatting of changelog entry for EntitySpan

Reformatted the entry for `EntitySpan` TypedDict in the changelog for better readability.

Author: bact

CHANGELOG.md

@@ -23,7 +23,8 @@ Security fixes and thai2rom_onnx bug fixes.
 
 ### Added
 
-- `EntitySpan` TypedDict to allow type checking of members (#1363).
+- `EntitySpan` TypedDict to allow type checking
+  of tagged entity members (#1363).
   Migration notes:
 
   ```python