Fix threadsafety comments

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@918836 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/lang3/Pair.java

@@ -23,7 +23,7 @@ import org.apache.commons.lang3.builder.HashCodeBuilder;
 /**
  * A basic immutable Object pair.
  *
- * <p>#ThreadSafe#
+ * <p>#ThreadSafe# if the objects are threadsafe</p>
  * @since Lang 3.0
  * @author Matt Benson
  */

src/main/java/org/apache/commons/lang3/SerializationException.java

@@ -21,7 +21,7 @@ package org.apache.commons.lang3;
  *
  * <p>The original error is wrapped within this one.</p>
  *
- * <p>#ThreadSafe#
+ * <p>#NotThreadSafe# because Throwable is not threadsafe</p>
  * @author Apache Software Foundation
  * @since 1.0
  * @version $Id$