fix: Jaeger propagator example of usage" (open-telemetry#937)

* fix: Jaeger propagator example of usage

* fix: Jaeger propagator example of usage

Author: shivkanya9146

packages/opentelemetry-propagator-jaeger/README.md

@@ -28,8 +28,10 @@ Example of usage:
 const { NodeTracerProvider } = require('@opentelemetry/node');
 const { JaegerHttpTracePropagator } = require('@opentelemetry/propagator-jaeger');
 
-const provider = new NodeTracerProvider({
-  HttpTextPropagator: new JaegerHttpTracePropagator()
+const provider = new NodeTracerProvider();
+provider.register({
+  // Use Jaeger propagator
+  propagator: new JaegerHttpTracePropagator()
 });
 ```