docs: Add pr link to changelog

ui/desktop/CHANGELOG.md

@@ -4,9 +4,9 @@ Canonical reference for changes, improvements, and bugfixes for Boundary Desktop
 
 ## Next
 
-### Changes
+### Bug Fixes
 
-- Trigger zoom-in menu option on keyboard shortcut.
+- ui: Trigger zoom-in menu option on keyboard shortcut. ([PR](https://github.com/hashicorp/boundary-ui/pull/505))
 
 ## v1.0.0-beta [CLI 0.1.8] (2021.03.10)