Pulling all pending Bukkit-JavaDoc changes

A special thanks goes to @aerouk for almost all of the changes found here.

src/main/java/org/bukkit/conversations/NullConversationPrefix.java

@@ -3,8 +3,8 @@ package org.bukkit.conversations;
 import org.bukkit.command.CommandSender;
 
 /**
- * NullConversationPrefix is a {@link ConversationPrefix} implementation that displays nothing in front of
- * conversation output.
+ * NullConversationPrefix is a {@link ConversationPrefix} implementation that
+ * displays nothing in front of conversation output.
  */
 public class NullConversationPrefix implements ConversationPrefix{