[tldoc] web update in tl guide

[Karl Berry]

Andreas S made a small enhancement to tangle and weave, so I thought it
should be mentioned in the news ... please update translations accordingly.
I still don't know of any further changes expected. --thanks, karl.

--- texlive-en.tex	(revision 62385)
+++ texlive-en.tex	(working copy)
@@ -4026,6 +4026,9 @@
 HINT viewers for GNU/Linux, Windows, and Android are available
 separately from \TL.
 
+\item \code{tangle}, \code{weave}: support optional third argument to
+specify output file.
+
 \item Knuth's program \code{twill} for making mini-indexes for original
 \texttt{WEB} programs now included.