Update 'index.html'

index.html

@@ -256,7 +256,7 @@
  <div class="subrow">
  <p class="subcl1">Erica Gargaglione</p>
  <p class="subcl2"><a href="hacking-maintenance-with-care/" target="_blank" class="ext">Hacking Maintenance with Care</a></p>
- <p class="subcl3"><a href="hacking-maintenance-with-care/pdf/HMWC.pdf" target="_blank" class="ext">PDF</a>
+ <p class="subcl3"><a href="hacking-maintenance-with-care/pdf/H-M-W-C.pdf" target="_blank" class="ext">PDF</a>
  </p></div>
  <div class="subrow">
  <p class="subcl1">Jian Haake [ohjian]</p>