Fix kafka streams start description typo in documentation

See gh-33098

Author: iamgd67

spring-boot-project/spring-boot-docs/src/docs/asciidoc/messaging/kafka.adoc

@@ -76,7 +76,7 @@ To use the factory bean, wire `StreamsBuilder` into your `@Bean` as shown in the
 include::{docs-java}/messaging/kafka/streams/MyKafkaStreamsConfiguration.java[]
 ----
 
-By default, the streams managed by the `StreamBuilder` object it creates are started automatically.
+By default, the streams managed by the `StreamBuilder` object are started automatically.
 You can customize this behavior using the configprop:spring.kafka.streams.auto-startup[] property.