Javadoc: Add missing @param tags for generics.

src/main/java/org/apache/commons/collections4/Bag.java

@@ -38,7 +38,7 @@ import java.util.Set;
  * In an ideal world, the interface would be changed to fix the problems, however
  * it has been decided to maintain backwards compatibility instead.
  *
- * @param <E> the type held in the bag
+ * @param <E> the type of elements in this bag
  * @since 2.0
  */
 public interface Bag<E> extends Collection<E> {

src/main/java/org/apache/commons/collections4/SortedBag.java

@@ -22,7 +22,7 @@ import java.util.Comparator;
  * Defines a type of <code>Bag</code> that maintains a sorted order among
  * its unique representative members.
  *
- * @param <E> the type to iterate over
+ * @param <E> the type of elements in this bag
  * @since 2.0
  */
 public interface SortedBag<E> extends Bag<E> {

src/main/java/org/apache/commons/collections4/bag/AbstractBagDecorator.java

@@ -26,6 +26,7 @@ import org.apache.commons.collections4.collection.AbstractCollectionDecorator;
  * <p>
  * Methods are forwarded directly to the decorated bag.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0
  */
 public abstract class AbstractBagDecorator<E>

src/main/java/org/apache/commons/collections4/bag/AbstractMapBag.java

@@ -38,6 +38,7 @@ import org.apache.commons.collections4.set.UnmodifiableSet;
  * map will be used to map bag elements to a number; the number represents the
  * number of occurrences of that element in the bag.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0 (previously DefaultMapBag v2.0)
  */
 public abstract class AbstractMapBag<E> implements Bag<E> {

src/main/java/org/apache/commons/collections4/bag/AbstractSortedBagDecorator.java

@@ -25,6 +25,7 @@ import org.apache.commons.collections4.SortedBag;
  * <p>
  * Methods are forwarded directly to the decorated bag.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0
  */
 public abstract class AbstractSortedBagDecorator<E>

src/main/java/org/apache/commons/collections4/bag/CollectionBag.java

@@ -34,7 +34,7 @@ import org.apache.commons.collections4.Bag;
  * The method javadoc highlights the differences compared to the original Bag interface.
  *
  * @see Bag
- * @param <E> the type held in the bag
+ * @param <E> the type of elements in this bag
  * @since 4.0
  */
 public final class CollectionBag<E> extends AbstractBagDecorator<E> {

src/main/java/org/apache/commons/collections4/bag/CollectionSortedBag.java

@@ -27,6 +27,7 @@ import org.apache.commons.collections4.SortedBag;
 /**
  * Decorates another {@link SortedBag} to comply with the Collection contract.
  *
+ * @param <E> the type of elements in this bag
  * @since 4.0
  */
 public final class CollectionSortedBag<E> extends AbstractSortedBagDecorator<E> {

src/main/java/org/apache/commons/collections4/bag/HashBag.java

@@ -33,6 +33,7 @@ import java.util.HashMap;
  * interface javadoc carefully as several methods violate the
  * {@link Collection} interface specification.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0 (previously in main package v2.0)
  */
 public class HashBag<E> extends AbstractMapBag<E> implements Serializable {

src/main/java/org/apache/commons/collections4/bag/PredicatedBag.java

@@ -37,6 +37,7 @@ import org.apache.commons.collections4.collection.PredicatedCollection;
  * <p>
  * This class is Serializable from Commons Collections 3.1.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0
  */
 public class PredicatedBag<E> extends PredicatedCollection<E> implements Bag<E> {

src/main/java/org/apache/commons/collections4/bag/PredicatedSortedBag.java

@@ -36,6 +36,7 @@ import org.apache.commons.collections4.SortedBag;
  * <p>
  * This class is Serializable from Commons Collections 3.1.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0
  */
 public class PredicatedSortedBag<E> extends PredicatedBag<E> implements SortedBag<E> {

src/main/java/org/apache/commons/collections4/bag/SynchronizedBag.java

@@ -30,6 +30,7 @@ import org.apache.commons.collections4.collection.SynchronizedCollection;
  * <p>
  * This class is Serializable from Commons Collections 3.1.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0
  */
 public class SynchronizedBag<E> extends SynchronizedCollection<E> implements Bag<E> {

src/main/java/org/apache/commons/collections4/bag/SynchronizedSortedBag.java

@@ -30,6 +30,7 @@ import org.apache.commons.collections4.SortedBag;
  * <p>
  * This class is Serializable from Commons Collections 3.1.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0
  */
 public class SynchronizedSortedBag<E> extends SynchronizedBag<E> implements SortedBag<E> {

src/main/java/org/apache/commons/collections4/bag/TransformedBag.java

@@ -33,6 +33,7 @@ import org.apache.commons.collections4.set.TransformedSet;
  * <p>
  * This class is Serializable from Commons Collections 3.1.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0
  */
 public class TransformedBag<E> extends TransformedCollection<E> implements Bag<E> {

src/main/java/org/apache/commons/collections4/bag/TransformedSortedBag.java

@@ -31,6 +31,7 @@ import org.apache.commons.collections4.Transformer;
  * <p>
  * This class is Serializable from Commons Collections 3.1.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0
  */
 public class TransformedSortedBag<E> extends TransformedBag<E> implements SortedBag<E> {

src/main/java/org/apache/commons/collections4/bag/TreeBag.java

@@ -38,6 +38,7 @@ import org.apache.commons.collections4.SortedBag;
  * copies of an object to be added or removed at once. It is important to read the interface
  * javadoc carefully as several methods violate the {@link Collection} interface specification.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0 (previously in main package v2.0)
  */
 public class TreeBag<E> extends AbstractMapBag<E> implements SortedBag<E>, Serializable {

src/main/java/org/apache/commons/collections4/bag/UnmodifiableBag.java

@@ -35,6 +35,7 @@ import org.apache.commons.collections4.set.UnmodifiableSet;
  * <p>
  * Attempts to modify it will result in an UnsupportedOperationException.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0
  */
 public final class UnmodifiableBag<E>

src/main/java/org/apache/commons/collections4/bag/UnmodifiableSortedBag.java

@@ -35,6 +35,7 @@ import org.apache.commons.collections4.set.UnmodifiableSet;
  * <p>
  * Attempts to modify it will result in an UnsupportedOperationException.
  *
+ * @param <E> the type of elements in this bag
  * @since 3.0
  */
 public final class UnmodifiableSortedBag<E>