Remove TODO

See spring-projectsgh-30156

Author: mhalbritter

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/ZipkinAutoConfiguration.java

@@ -62,7 +62,6 @@ public BytesEncoder<Span> spanBytesEncoder() {
 	@Bean
 	@ConditionalOnMissingBean
 	public Reporter<Span> spanReporter(Sender sender, BytesEncoder<Span> encoder) {
-		// TODO MH: Calling close() drops spans, must be flush() and close()
 		return AsyncReporter.builder(sender).build(encoder);
 	}