Fix DocumentStatus URL

Author: stevejgordon

docs/runtime/dotnet-metrics.md

@@ -675,5 +675,5 @@ This metric reports the same values as calling [`AppDomain.CurrentDomain.FirstCh
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-[DocumentStatus]: https://github.com/open-telemetry/opentelemetry-specification/tree/v1.31.0/specification/document-status.md
+[DocumentStatus]: https://opentelemetry.io/docs/specs/otel/document-status
 [MetricRecommended]: /docs/general/metric-requirement-level.md#recommended