Added margin to "feature enhancement" node to get text to fit in box. This...

Added margin to "feature enhancement" node to get text to fit in box. This doesn't seem to work in Firefox though.

workshops/image-feature-enhancement.md

@@ -6,7 +6,7 @@ digraph G {
     image -> filter -> "enhanced image";
     node [shape=box, color=grey, fontcolor=grey];
     "enhanced image" -> "feature" [label=" aka", style=dashed, color=grey, fontcolor=grey, fontsize=10];
-    node [shape=box, color=grey, fontcolor=grey, width=0, height=0 ,margin=0];
+    "feature enhancement" [shape=box, color=grey, fontcolor=grey, margin=0.05];
     filter -> "feature enhancement" [label=" aka", style=dashed, color=grey, fontcolor=grey, fontsize=10];   
 }
 '/>