Enhance OpenTelemetry configuration documentation

- Added `head_sampling_rate` and `persist` options for traces and logs in the OpenTelemetry configuration example.
- Improved clarity in the tracing documentation regarding default sampling rates and configuration options.

Author: nevikashah

src/content/docs/workers/observability/exporting-opentelemetry-data/index.mdx

@@ -64,14 +64,21 @@ After setting up destinations in the dashboard, configure your Worker to export
     "traces": {
       "enabled": true,
       "destinations": ["tracing-destination-name"],
+      
       // traces sample rate of 5%
       "head_sampling_rate": 0.05
+
+      //traces not sent to the Cloudflare Dashboard
+      "persist": false
     },
     "logs": {
       "enabled": true,
       "destinations": ["logs-destination-name"],
       // logs sample rate of 60%
-      "head_sampling_rate": 0.6
+      "head_sampling_rate": 0.6,
+      
+      //traces not sent to the Cloudflare Dashboard
+      "persist": false
     }
   }
 }

src/content/docs/workers/observability/traces/index.mdx

@@ -64,6 +64,8 @@ You can also configure tracing independently by setting `observability.traces.en
 
 </WranglerConfig>
 
+
+
 ### Exporting OpenTelemetry traces to a 3rd party destination
 
 Workers tracing follows [OpenTelemetry (OTel) standards](https://opentelemetry.io/). This makes it compatible with popular observability platforms,
@@ -76,8 +78,7 @@ Learn more about exporting OpenTelemetry data from Workers [here](/workers/obser
 
 :::note[Default Sampling Rate]
 
-The default sampling rate is `1`, meaning 100% of requests will be traced if tracing is enabled. Set `head_sampling_rate` if
-you want to trace fewer requests.
+The default sampling rate is `1`, meaning 100% of requests will be traced if tracing is enabled. Set `head_sampling_rate` if you want to trace fewer requests.
 
 :::