Fix Javadoc warnings

Author: garydgregory

src/changes/changes.xml

@@ -49,6 +49,7 @@ The <action> type attribute can be add,update,fix,remove.
     <release version="1.0.0-alpha7" date="YYYY-MM-DD" description="This release requires Java 8.">
       <!-- FIX -->
       <action type="fix" dev="ggregory" due-to="Gary Gregory">Fix Apache RAT plugin console warnings.</action>
+      <action type="fix" dev="ggregory" due-to="Gary Gregory">Fix Javadoc warnings.</action>
       <!-- ADD -->
       <!-- UPDATE -->
       <action type="update" dev="ggregory" due-to="Gary Gregory, Dependabot">Bump org.apache.commons:commons-parent from 83 to 94 #527, #530, #539, #544, #546.</action>