Fix URL in .NET doc

Author: vastin

src/docs/getting-started/dotnet-sdk/auto-instr.mdx

@@ -50,7 +50,7 @@ automatically when your applicaiton start. For many cases, this is all you need
 
 ### Configuring Auto-Instrumentation
 
-By default ADOT .NET auto-Instrumentation uses the [OTLP exporter](https://github.com/open-telemetry/opentelemetry-.NET/tree/master/exporters/otlp)
+By default ADOT .NET auto-Instrumentation uses the [OTLP exporter](https://github.com/open-telemetry/opentelemetry-dotnet/tree/main/src/OpenTelemetry.Exporter.OpenTelemetryProtocol)
 and is configured to send data to a [OpenTelemetry collector](https://github.com/open-telemetry/opentelemetry-collector/blob/master/receiver/otlpreceiver/README.md)
 at `http://localhost:4317` for both metrics and traces.