[PS] Add more notes

semester4/ps/ps-jh/parts/07_tests/02_examples.tex

@@ -2,7 +2,7 @@
 \coloredbox{red}{REWRITE}{
     This section is undergoing a rewrite, to be more on-point. The previous section may also see some changes as a result.
 }
-\coloredbox{gray}{How-To: Tests}{
+\howto{Tests}{
     Was zu tun / erwähnen ist jeweils:
     \begin{enumerate}
         \item Modell: Verteilung der Stichproben $\cX_k$ unter $\P_\vartheta$, mit $\vartheta =$ gesuchte Werte.