Fix up references

Author: garydgregory

src/main/javadoc/overview.html

@@ -64,7 +64,7 @@ <h2>Defining the CLI</h2>
         <code>Options</code>.
       </p>
       <p>
-        The <a href="usage.html">Usage Scenarios</a> document provides
+        The <a href="#Using">Usage Scenarios</a> document provides
         examples how to create an <code>Options</code> object and also
         provides some real world examples.
       </p>