doc/doxygen/refman.tex: capitalize title

doc/doxygen/refman.tex

@@ -114,7 +114,7 @@ Documentation License”.
 \hypertarget{AdvancedExamples}{}
 \input{AdvancedExamples}
 
-\chapter{How to optimize performance with StarPU}
+\chapter{How To Optimize Performance With StarPU}
 \label{HowToOptimizePerformanceWithStarPU}
 \hypertarget{HowToOptimizePerformanceWithStarPU}{}
 \input{HowToOptimizePerformanceWithStarPU}