Fix some javadoc warnings found with `ant javadoc` build target

src/java/org/jivesoftware/openfire/group/ConcurrentGroupMap.java

@@ -32,7 +32,7 @@ public class ConcurrentGroupMap<K, V> extends ConcurrentHashMap<K, V>  implement
 	 * is not found in the key list, search the key list for groups and 
 	 * look for the JID in each of the corresponding groups.
 	 * 
-	 * @param o The target, presumably a JID
+	 * @param key The target, presumably a JID
 	 * @return True if the target is in the key list, or in any groups in the key list
 	 */
 	public boolean includesKey(Object key) {

src/java/org/jivesoftware/openfire/group/GroupManager.java

@@ -300,7 +300,7 @@ public class GroupManager {
     /**
      * Returns the corresponding group if the given JID represents a group. 
      *
-     * @param groupJID The JID for the group to retrieve
+     * @param jid The JID for the group to retrieve
      * @return The group corresponding to the JID, or null if the JID does not represent a group
      * @throws GroupNotFoundException if the JID represents a group that does not exist
      */

src/java/org/jivesoftware/openfire/ldap/LdapManager.java

@@ -2208,7 +2208,7 @@ public class LdapManager {
      * Escapes any special chars (RFC 4515) from a string representing
      * a search filter assertion value.
      *
-     * @param input The input string.
+     * @param value The input string.
      *
      * @return A assertion value string ready for insertion into a 
      *         search filter string.

src/java/org/jivesoftware/openfire/nio/ByteBufferWriter.java

@@ -26,7 +26,7 @@ import java.io.Writer;
 import java.nio.charset.CharsetEncoder;
 
 /**
- * Wrapper on a MINA {@link ByteBuffer} that extends the Writer class.
+ * Wrapper on a MINA {@link IoBuffer} that extends the Writer class.
  *
  * @author Gaston Dombia
  */

src/java/org/jivesoftware/openfire/pubsub/PubSubEngine.java

@@ -1152,7 +1152,7 @@ public class PubSubEngine {
      * @param iq
      * @param childElement
      * @param createElement
-     * @return
+     * @return {@link CreateNodeResponse}
      */
     private CreateNodeResponse createNodeHelper(PubSubService service, IQ iq, Element childElement, Element createElement) {
         // Get sender of the IQ packet