quenched typos, enhanced readability in few places AND updated the "Mother of all Flowcharts" (here to stay)

doc/handbook/tutorial-decoupled.tex

@@ -290,7 +290,7 @@ compile the program.
 \end{figure}
 
 \begin{figure}[h]
-\psfrag{pw}{$p_w = 5 \times 10^5$ \text{Pa}}
+\psfrag{pw}{$p_w = 5 \times 10^5$ [\text{Pa}]}
 \psfrag{S}{$S_n = 1.0$}
 \psfrag{qw}{$q_w = 2 \times 10^{-4}$ [kg/$\text{m}^2$s]}
 \psfrag{qo}{$q_n = 0.0$ [kg/$\text{m}^2$s]}