Fix for contributed by ewanmellor.
Fix doc comment regarding the replacement character used by
SafeContentHandler.  This comment has been incorrect since
(Sep 2011).
@@ -31,7 +31,8 @@ import org.xml.sax.helpers.AttributesImpl;
* ({@link #characters(char[], int, int)} or
* {@link #ignorableWhitespace(char[], int, int)}) passed to the decorated
* content handler contain only valid XML characters. All invalid characters
- * are replaced with spaces.
+ * are replaced with the Unicode replacement character U+FFFD (though a
+ * subclass may change this by overriding the writeReplacement method).
* <p>
* The XML standard defines the following Unicode character ranges as
* valid XML characters:
