Use addOpenTelemetryInstrumentation method (#10398)

Author: AbhiPrasad

docs/platforms/javascript/common/tracing/instrumentation/opentelemetry.mdx

@@ -29,7 +29,6 @@ const Sentry = require("@sentry/node");
 const {
   GenericPoolInstrumentation,
 } = require("@opentelemetry/instrumentation-generic-pool");
-const { registerInstrumentations } = require("@opentelemetry/instrumentation");
 
 Sentry.init({
   dsn: "__DSN__",
@@ -39,9 +38,7 @@ Sentry.init({
 });
 
 // Afterwards, you can add additional instrumentation:
-registerInstrumentations({
-  instrumentations: [new GenericPoolInstrumentation()],
-});
+Sentry.addOpenTelemetryInstrumentation(new GenericPoolInstrumentation());
 ```
 
 Any instrumentation added like this will be automatically picked up by Sentry.