Add PR number

Author: scorpionknifes

CHANGELOG.md

@@ -33,7 +33,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### Deprecated
 
 - The deprecated `go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho` package has found a Code Owner.
-  The package is no longer deprecated. (#)
+  The package is no longer deprecated. (#6207)
 
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