mention expansion of norm() to handle hamming norm (commented out for now)

docs.html

@@ -19116,6 +19116,7 @@ List of additions and changes for each version:
 <li>added <a href="#log_det_sympd">log_det_sympd()</a> for log determinant of symmetric positive matrices</li>
 <li>added <code>ARMA_WARN_LEVEL</code> <a href="#config_hpp">configuration option</a>, to control the degree of emitted warning messages</li>
 <li>reduced the default degree of warning messages, so that failed decompositions, failed saving/loading, etc, no longer emit warnings</li>
+<!-- <li>expanded <a href="#norm">norm()</a> to handle Hamming "norm" (number of non-zero elements)</li> -->
 </ul>
 </li>
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