Fixing javadocs

Change-Id: I8e7f6451876c6733bf33667face30b32e5378c99
diff --git a/core/api/src/main/java/org/onosproject/net/AbstractProjectableModel.java b/core/api/src/main/java/org/onosproject/net/AbstractProjectableModel.java
index 4c66e91..9444e32 100644
--- a/core/api/src/main/java/org/onosproject/net/AbstractProjectableModel.java
+++ b/core/api/src/main/java/org/onosproject/net/AbstractProjectableModel.java
@@ -88,7 +88,7 @@
     }
 
     /**
-     * Returns the currently bound driver or null of no driver is bound.
+     * Returns the currently bound driver or null if no driver is bound.
      *
      * @return bound driver; null if none
      */