Update weiducourse.html

Correcting URL for appendix

readmes/weiducourse/weiducourse.html

@@ -26,7 +26,7 @@ <h1>A course on WEIDU</h1>
 <li><a href="weiducourse_2.html">Chapter 2 (Programming in WEIDU)</a></li>
 <li><a href="weiducourse_3.html">Chapter 3 (Specific WEIDU commands)</a></li>
 <li><a href="weiducourse_4.html">Chapter 4 (More advanced topics)</a></li>
-<li><a href="weiducourse_A.html">Appendix (the WEIDU readme)</a></li>
+<li><a href="weiducourse_a.html">Appendix (the WEIDU readme)</a></li>
 </ul>
 </p>
 <p>This is a course in basic-to-intermediate WEIDU. The level is somewhat uneven: Chapter 1 explains the basics of WEIDU without assuming any prior modding or programming experience, and I hope should be helpful to new modders. Chapter 2 is a more sophisticated and in-depth discussion, focussing on using WEIDU as a programming language (and de-prioritizing specific applications to IE games); I hope intermediate WEIDU users will find it a good way to get to the next step, and even advanced users might learn something. Chapter 3 discusses some specific programming tasks relevant to IE games, and Chapter 4 discusses some more advanced topics.</p>
@@ -50,4 +50,4 @@ <h1>A course on WEIDU</h1>
 <li>New appendix that explains what's where in the official WEIDU readme.</li>
 </div>
 </div>
-</body>
+</body>