Generic ROADM port models and descriptions

Change-Id: I053d61c7a057d6298b7990373448df28b3aaa5a5
diff --git a/core/api/src/main/java/org/onosproject/net/SparseAnnotations.java b/core/api/src/main/java/org/onosproject/net/SparseAnnotations.java
index a615456..e86b50c 100644
--- a/core/api/src/main/java/org/onosproject/net/SparseAnnotations.java
+++ b/core/api/src/main/java/org/onosproject/net/SparseAnnotations.java
@@ -34,7 +34,7 @@
 
     /**
      * Indicates whether the specified key has been tagged as removed. This is
-     * used to for merging sparse annotation sets.
+     * used for merging sparse annotation sets.
      *
      * @param key annotation key
      * @return true if the previous annotation has been tagged for removal