fixup! Update design flow image

graphics/design_flow.tex

@@ -8,10 +8,9 @@ draw=black!50, thick, font=\footnotesize, fill=white},
 \begin{document}
 \begin{tikzpicture}[on grid,y=1.2cm,x=3.2cm]
     \draw[fill=lightgray] (-1.7cm , 0.5cm) rectangle (5cm, -2.8cm);
-    \draw (3.4cm,0cm) node[draw=none, fill=none] (wf) {Waterfall};
     \draw[fill=lightgray] (-1.7cm,-3cm) rectangle (5cm, -7.2cm);
     \input{design_flow.tikz}
-    \draw (3.4cm,0cm) node[draw=none, fill=none] (wf) {Waterfall};
+    \draw (3.4cm,0cm) node[draw=none, fill=none,text width=2.9cm] (wf) {Systems Engineering:\\Waterfall};
     \node (ridm)[right=1 of fs, fill=none, draw=none] {Rapid iterative Design Method};
 \end{tikzpicture}
 \end{document}