tutorials: update link to documentation

contents/tutorials/2019-11-HPNS-Inria/index.html

@@ -527,7 +527,7 @@ Try to run it with various numbers of tasks.
 
 <p>
 This is based on StarPU's documentation
-<a href="http://starpu.gforge.inria.fr/doc/html/HowToOptimizePerformanceWithStarPU.html">optimization
+<a href="http://starpu.gforge.inria.fr/doc/html/CheckListWhenPerformanceAreNotThere.html">optimization
   chapter.</a>
 </p>
 
@@ -824,7 +824,7 @@ Homepage of the Klang-Omp OpenMP compiler: <a href="http://kstar.gforge.inria.fr
 <h2>More Performance Optimizations</h2>
 <p>
 The StarPU
-documentation <a href="http://starpu.gforge.inria.fr/doc/html/PerformanceFeedback.html">performance
+documentation chapter<a href="http://starpu.gforge.inria.fr/doc/html/OfflinePerformanceTools.html">performance
     feedback chapter</a> provides more optimization tips for further
 reading after this tutorial.
 </p>