Update docs: Replace 404 link with updated article
<li>Java opcodes:
<ul>
<li><a href="opcodes.html">Simplified ASM set</a></li>
- <li><a href="https://cs.au.dk/~mis/dOvs/jvmspec/ref-Java.html">Standard set</a></li>
+ <li><a href="https://docs.oracle.com/javase/specs/jvms/se11/html/jvms-6.html">Standard set</a></li>
</ul>
</li>
</ul>
