Updated PR number in CHANGELOG

Signed-off-by: Brad Topol <btopol@us.ibm.com>

CHANGELOG.md

@@ -37,7 +37,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### Added
 
 - Add the `go.opentelemetry.io/otel/semconv/v1.9.0` package.
-  The package contains semantic conventions from the `v1.9.0` version of the OpenTelemetry specification. (#xxxx)
+  The package contains semantic conventions from the `v1.9.0` version of the OpenTelemetry specification. (#2792)
 - The metrics global package was added back into several test files. (#2764)
 - The `Meter` function is added back to the `go.opentelemetry.io/otel/metric/global` package.
   This function is a convenience function equivalent to calling `global.MeterProvider().Meter(...)`. (#2750)