fixup! feat(instrumentation): added synchronous gauge

Author: clintonb

api/CHANGELOG.md

@@ -8,6 +8,8 @@ All notable changes to this project will be documented in this file.
 
 ### :rocket: (Enhancement)
 
+* feat(metrics): added synchronous gauge [#4528](https://github.com/open-telemetry/opentelemetry-js/pull/4528) @clintonb
+
 ### :bug: (Bug Fix)
 
 ### :books: (Refine Doc)