Fix broken Javadoc links, replace deprecated methods in usage examples,

and add a missing method to HelpFormatter (apache#424).

Author: garydgregory

src/changes/changes.xml

@@ -27,6 +27,7 @@
       <action type="fix" dev="ggregory" due-to="Elric">Fix broken Introduction links on the website #417.</action>
       <action type="fix" dev="ggregory" due-to="Gary Gregory">Fix malformed Javadoc comments.</action>
       <action type="fix" dev="ggregory" due-to="Dan Ziemba, Ken Dombeck, Gary Gregory" issue="CLI-352">Correct HelpFormatter Javadoc #418.</action>
+      <action type="fix" dev="ggregory" due-to="Elric, Gary Gregory">Fix broken Javadoc links, replace deprecated methods in usage examples, and add a missing method to HelpFormatter (#424).</action>
       <!-- ADD -->
       <!-- UPDATE -->
       <action type="update" dev="ggregory" due-to="Gary Gregory, Dependabot">Bump org.apache.commons:commons-parent from 91 to 102 #414, #416.</action>