(libformatter.tex): Document the flush() method on the writer.
diff --git a/Doc/libformatter.tex b/Doc/libformatter.tex
index 42783fb..86e6db1 100644
--- a/Doc/libformatter.tex
+++ b/Doc/libformatter.tex
@@ -216,6 +216,10 @@
\renewcommand{\indexsubitem}{(writer object method)}
+\begin{funcdesc}{flush}{}
+Flush any buffered output or device control events.
+\end{funcdesc}
+
\begin{funcdesc}{new_alignment}{align}
Set the alignment style. The \code{align} value can be any object,
but by convention is a string or \code{None}, where \code{None}