fixup! Update design flow image

graphics/design_flow.tikz

@@ -1,7 +1,8 @@
+%&tex
     \node (pd) {Problem Description};
-    \node (sp)[below=1 of pd]  {Specifications};
+    \node (sp)[below=1 of pd]  {System\\Requirements};
     \node (id)[below=1 of sp]  {Initial Design};
-    \node (fs)[below=1 of id]  {Feature Seperation};
+    \node (fs)[below=1 of id]  {Feature Definition};
     \node (ss)[below=1 of fs]  {Feature Selection};
     \node (a1)[below=0.8 of ss,draw=none, fill=none] {};
     \node (rd)[below=0.8 of a1]  {Rapid Development};