undeprecate the entry-level zipkin things as they are documented

spring-cloud-sleuth-zipkin/src/main/java/org/springframework/cloud/sleuth/zipkin2/ZipkinAutoConfiguration.java

@@ -60,10 +60,7 @@ import org.springframework.web.client.RestTemplate;
  * @since 1.0.0
  * @see ZipkinRestTemplateCustomizer
  * @see DefaultZipkinRestTemplateCustomizer
- * @deprecated This type should have never been public and will be hidden or removed in
- * 3.0
  */
-@Deprecated
 @Configuration(proxyBeanMethods = false)
 @EnableConfigurationProperties(ZipkinProperties.class)
 @ConditionalOnProperty(value = { "spring.sleuth.enabled", "spring.zipkin.enabled" },
@@ -72,6 +69,7 @@ import org.springframework.web.client.RestTemplate;
 @AutoConfigureAfter(
 		name = "org.springframework.cloud.autoconfigure.RefreshAutoConfiguration")
 @Import(ZipkinSenderConfigurationImportSelector.class)
+// public because the constant REPORTER_BEAN_NAME was documented
 public class ZipkinAutoConfiguration {
 
 	private static final Log log = LogFactory.getLog(ZipkinAutoConfiguration.class);

spring-cloud-sleuth-zipkin/src/main/java/org/springframework/cloud/sleuth/zipkin2/ZipkinProperties.java

@@ -27,7 +27,7 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
  * @since 1.0.0
  */
 @ConfigurationProperties("spring.zipkin")
-// TODO: Hide in 3.x, if it isn't already deleted
+// public as the senders that use this are in another package
 public class ZipkinProperties {
 
 	/**

tests/spring-cloud-sleuth-instrumentation-async-tests/src/test/java/org/springframework/cloud/sleuth/instrument/async/TraceAsyncIntegrationTests.java

@@ -39,8 +39,7 @@ import org.springframework.test.context.junit4.SpringRunner;
 import static org.assertj.core.api.Assertions.assertThat;
 
 @RunWith(SpringRunner.class)
-@SpringBootTest(
-		webEnvironment = SpringBootTest.WebEnvironment.NONE,
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.NONE,
 		classes = { TraceAsyncIntegrationTests.TraceAsyncITestConfiguration.class })
 public class TraceAsyncIntegrationTests {