Use builder methods in getting started docs
* Fix topic name in getting started documentation
It was "my-topic", when it should have been
persistent://public/default/my-topic.
* Remove topic changes
@@ -84,8 +84,8 @@ Here's an example producer for a Pulsar {% popover topic %} using the [Java](../
```java
String localClusterUrl = "pulsar://localhost:6650";
-PulsarClient client = PulsarClient.create(localClusterUrl);
-Producer producer = client.createProducer("my-topic");
+PulsarClient client = PulsarClient.builder().serviceURL(localClusterUrl).build();
+Producer<byte[]> producer = client.newProducer().topic("my-topic").create();
```
Here's an example [Python](../../clients/Python) producer:
