Fix some missing javadoc.

pandalib-commands/src/main/java/fr/pandacube/lib/commands/BadCommandUsage.java

@@ -11,18 +11,30 @@ import java.util.logging.Logger;
  */
 public class BadCommandUsage extends RuntimeException {
 
+	/** Constructs a new runtime exception with no message or cause.
+	 */
 	public BadCommandUsage() {
 		super();
 	}
-	
+
+	/** Constructs a new runtime exception with the specified cause.
+	 * @param cause the cause.
+	 */
 	public BadCommandUsage(Throwable cause) {
 		super(cause);
 	}
 
+	/** Constructs a new runtime exception with the specified message.
+	 * @param message the message.
+	 */
 	public BadCommandUsage(String message) {
 		super(message);
 	}
-	
+
+	/** Constructs a new runtime exception with the specified message and cause.
+	 * @param message the message.
+	 * @param cause the cause.
+	 */
 	public BadCommandUsage(String message, Throwable cause) {
 		super(message, cause);
 	}