Fix all javadoc warnings

Change-Id: I26ba78195fd8245eeb25c29ba27cc4b11b2eb791
diff --git a/utils/misc/src/main/java/org/onlab/util/GuavaCollectors.java b/utils/misc/src/main/java/org/onlab/util/GuavaCollectors.java
index 1406443..40043e4 100644
--- a/utils/misc/src/main/java/org/onlab/util/GuavaCollectors.java
+++ b/utils/misc/src/main/java/org/onlab/util/GuavaCollectors.java
@@ -31,6 +31,7 @@
      * Returns a {@code Collector} that accumulates the input elements into a
      * new ImmutableSet.
      *
+     * @param <T> type
      * @return a {@code Collector} which collects all the input elements into a
      * {@code ImmutableSet}
      */
@@ -46,6 +47,7 @@
      * Returns a {@code Collector} that accumulates the input elements into a
      * new ImmutableList.
      *
+     * @param <T> type
      * @return a {@code Collector} which collects all the input elements into a
      * {@code ImmutableList}, in encounter order
      */
diff --git a/utils/misc/src/main/java/org/onlab/util/UnmodifiableDeque.java b/utils/misc/src/main/java/org/onlab/util/UnmodifiableDeque.java
index c3bdb8a..103711f 100644
--- a/utils/misc/src/main/java/org/onlab/util/UnmodifiableDeque.java
+++ b/utils/misc/src/main/java/org/onlab/util/UnmodifiableDeque.java
@@ -40,6 +40,7 @@
     /**
      * Returns an unmodifiable view of the specified Deque.
      *
+     * @param <T> type
      * @param deque underlying {@link Deque} to use.
      * @return unmodifiable view of {@code deque}
      */