Misc improvements. Primarily Javadoc.

Change-Id: I083bbf559d53fa25f79d4e1e53eb15c6b96290f2
diff --git a/core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java b/core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java
index 1b71b5a..f620e08 100644
--- a/core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java
+++ b/core/api/src/main/java/org/onosproject/store/service/AtomicCounter.java
@@ -16,7 +16,7 @@
 package org.onosproject.store.service;
 
 /**
- * An atomic counter dispenses monotonically increasing values.
+ * Distributed version of java.util.concurrent.atomic.AtomicLong.
  */
 public interface AtomicCounter {