Minor correction of mistake in boundary in chapter name

Information/HeatTransfer/Components/Demo_vertical_opening_thermal_mode.tex

@@ -14,7 +14,7 @@
 \begin{document}
     \maketitle
     
-    \section{$\frac{-H}{2} \leq z \leq \frac{-H}{2} $}
+    \section{$\frac{-H}{2} \leq z \leq \frac{H}{2} $}
     
         \subsection{Mass flow rate from buoyancy calculation}