Update @EnableOpenTelemetry javadoc (#11799)

Author: jeanbisutti

instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/EnableOpenTelemetry.java

@@ -12,7 +12,10 @@
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 
-/** Auto-configures OpenTelemetry. Enables OpenTelemetry in Spring applications */
+/**
+ * Convenient annotation to leverage Spring autoconfiguration for OpenTelemetry in non-Spring Boot
+ * projects.
+ */
 @Configuration
 @ComponentScan(basePackages = "io.opentelemetry.instrumentation.spring.autoconfigure")
 @Target(ElementType.TYPE)