Updated XRay sampler documentation for .Net Instrumentation

Author: AsakerMohd

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

@@ -71,9 +71,16 @@ You can use CloudWatch Application Signals to automatically instrument your appl
 
 The ADOT .NET Auto-Instrumentation can be configured to use [X-Ray remote sampling](https://docs.aws.amazon.com/xray/latest/devguide/xray-console-sampling.html)
 by setting the environment variable `OTEL_TRACES_SAMPLER=xray`. You will also need to [configure the OpenTelemetry collector](/docs/getting-started/remote-sampling)
-to allow the application to fetch sampling configuration. By default the sampler sends requests to `http://localhost:2000`. By setting `OTEL_TRACES_SAMPLER_ARG` 
+to allow the application to fetch sampling configuration. 
+
+You can further configure the Sampler by setting the `OTEL_TRACES_SAMPLER_ARG` environment variable. You can update the endpoint and the polling rate as follows:
+```
+OTEL_TRACES_SAMPLER_ARG=endpoint=<ENDPOINT>,polling_interval=<INTERVAL_IN_SECS>
+``` 
+
+By default the sampler sends requests to `http://localhost:2000` and has a polling rate of `300 seconds`. By setting `OTEL_TRACES_SAMPLER_ARG` 
 environment variable you can change the endpoint the sampler talks with when getting sampling configuration from AWS X-Ray Console. For example setting 
-`OTEL_TRACES_SAMPLER_ARG=endpoint=http://localhost:4000` would configure the sampler to communicate with `http://localhost:4000`.
+`OTEL_TRACES_SAMPLER_ARG=endpoint=http://localhost:4000,polling_interval=60` would configure the sampler to communicate with `http://localhost:4000` and poll the sampling rules every `60 seconds`.
 
 ## Using Manual Instrumentation