Update javadoc for observer configuration

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1765392 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/sling/spi/resource/provider/ObserverConfiguration.java b/src/main/java/org/apache/sling/spi/resource/provider/ObserverConfiguration.java
index fd510db..95bc3db 100644
--- a/src/main/java/org/apache/sling/spi/resource/provider/ObserverConfiguration.java
+++ b/src/main/java/org/apache/sling/spi/resource/provider/ObserverConfiguration.java
@@ -29,6 +29,10 @@
 /**
  * A observer configuration describes active configurations from registered listeners.
  *
+ * All implementations of {@code ObserverConfiguration} are comparable using the
+ * {@link Object#equals(Object)} method. Two configurations are equal, if they
+ * have exactly the same parameters.
+ *
  * @since 1.0.0 (Sling API Bundle 2.11.0)
  */
 @ProviderType