- handled one more codeexample that was added after branching.

  (related issues pgf-tikz#640, pgf-tikz#711, pgf-tikz#729)

doc/generic/pgf/text-en/pgfmanual-en-tikz-actions.tex

@@ -364,12 +364,12 @@ \subsubsection{Graphic Parameters: Dash Pattern}
 \begin{key}{/tikz/dash expand off}
     Makes the |off| part of a dash pattern expandable such that it can stretch.
     This only works when there is a single |on| and a single |off| field and
-    requires the |decorations| library.  Right now this option has to be
-    specified on the path where it is supposed to take effect after the |dash
-    pattern| option because the dash pattern has to be known at the point where
-    it is applied.
+    requires the |decorations| library. Right now this option has to be
+    specified on the path where it is supposed to take effect after the
+    |dash pattern| option because the dash pattern has to be known at the point
+    where it is applied.
     %
-\begin{codeexample}[]
+\begin{codeexample}[preamble={\usetikzlibrary{decorations}}]
 \begin{tikzpicture}[|-|, dash pattern=on 4pt off 2pt]
   \draw [dash expand off] (0pt,30pt) -- (26pt,30pt);
   \draw [dash expand off] (0pt,20pt) -- (24pt,20pt);