Fix the Statistics resource title

The Swagger GUI uses this string. "Query flow statistics" is misleading
as this resource also contains port statistics. This was initially just
flow statistics resource before also adding port statistics to it.

Change-Id: I7762159b18284cee0293684d260fb0a1806218bb
diff --git a/web/api/src/main/java/org/onosproject/rest/resources/StatisticsWebResource.java b/web/api/src/main/java/org/onosproject/rest/resources/StatisticsWebResource.java
index 9de0c5f..9667182 100644
--- a/web/api/src/main/java/org/onosproject/rest/resources/StatisticsWebResource.java
+++ b/web/api/src/main/java/org/onosproject/rest/resources/StatisticsWebResource.java
@@ -52,7 +52,7 @@
 import static org.onosproject.net.PortNumber.portNumber;
 
 /**
- * Query flow statistics.
+ * Query statistics.
  */
 @Path("statistics")
 public class StatisticsWebResource  extends AbstractWebResource {