Polish appendix cross-references

See gh-29689

spring-boot-project/spring-boot-docs/src/docs/asciidoc/features/testing.adoc

@@ -813,7 +813,7 @@ By default, it configures a `MockWebServiceClient` bean that can be used to call
 (For more about using Web Services with Spring Boot, see "<<io#io.webservices>>", earlier in this chapter.)
 
 
-TIP: A list of the auto-configuration settings that are enabled by `@WebServiceServerTest` can be <<test-auto-configuration#test-auto-configuration,found in the appendix>>.
+TIP: A list of the auto-configuration settings that are enabled by `@WebServiceServerTest` can be <<test-auto-configuration#appendix.test-auto-configuration,found in the appendix>>.
 
 The following example shows the `@WebServiceServerTest` annotation in use:
 

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

@@ -83,7 +83,7 @@ You can customize this behavior using the configprop:spring.kafka.streams.auto-s
 
 [[messaging.kafka.additional-properties]]
 === Additional Kafka Properties
-The properties supported by auto configuration are shown in <<application-properties#application-properties>>.
+The properties supported by auto configuration are shown in <<appendix.application-properties#application-properties>>.
 Note that, for the most part, these properties (hyphenated or camelCase) map directly to the Apache Kafka dotted properties.
 See the Apache Kafka documentation for details.