KAFKA-10222: Incorrect methods show up in 0.10 Kafka Streams docs (#8980)

Non-existent methods show up in the doc:
builder.from("my-input-topic").mapValue(value -> value.length().toString()).to("my-output-topic");

There is no method named from or mapValues. They should be stream and mapValues respectively.

Reviewers: Matthias J. Sax <matthias@confluent.io>

streams/src/main/java/org/apache/kafka/streams/KafkaStreams.java

@@ -71,7 +71,7 @@ import java.util.concurrent.atomic.AtomicInteger;
  *    StreamsConfig config = new StreamsConfig(props);
  *
  *    KStreamBuilder builder = new KStreamBuilder();
- *    builder.from("my-input-topic").mapValue(value -> value.length().toString()).to("my-output-topic");
+ *    builder.stream("my-input-topic").mapValues(value -> value.length().toString()).to("my-output-topic");
  *
  *    KafkaStreams streams = new KafkaStreams(builder, config);
  *    streams.start();