fix(changelog): add changelog entry

Author: pichlermarc

CHANGELOG.md

@@ -25,6 +25,7 @@ For experimental package changes, see the [experimental CHANGELOG](experimental/
 * fix(selenium-tests): updated webpack version for selenium test issue [#3456](https://github.com/open-telemetry/opentelemetry-js/issues/3456) @SaumyaBhushan
 * fix(sdk-metrics): fix duplicated registration of metrics for collectors [#3488](https://github.com/open-telemetry/opentelemetry-js/pull/3488) @legendecas
 * fix(core): fix precision loss in numberToHrtime [#3480](https://github.com/open-telemetry/opentelemetry-js/pull/3480) @legendecas
+* fix(sdk-metrics): deprecate instrument type in InstrumentDescriptor [#3520](https://github.com/open-telemetry/opentelemetry-js/pull/3520) @pichlermarc
 
 ### :books: (Refine Doc)