Beef up the unicode() description a bit, based on material from AMK's
"What's New in Python ..." documents.
diff --git a/Doc/lib/libfuncs.tex b/Doc/lib/libfuncs.tex
index 42b3497..58039dd 100644
--- a/Doc/lib/libfuncs.tex
+++ b/Doc/lib/libfuncs.tex
@@ -688,10 +688,18 @@
\end{funcdesc}
\begin{funcdesc}{unicode}{string\optional{, encoding\optional{, errors}}}
-Decodes \var{string} using the codec for \var{encoding}. Error
-handling is done according to \var{errors}. The default behavior is
-to decode UTF-8 in strict mode, meaning that encoding errors raise
-\exception{ValueError}. See also the \refmodule{codecs} module.
+Create a Unicode string from an 8-bit string \var{string} using the
+codec for \var{encoding}. The \var{encoding} parameter is a string
+giving the name of an encoding. Error handling is done according to
+\var{errors}; this specifies the treatment of characters which are
+invalid in the input encoding. If \var{errors} is \code{'strict'}
+(the default), a \exception{ValueError} is raised on errors, while a
+value of \code{'ignore'} causes errors to be silently ignored, and a
+value of \code{'replace'} causes the official Unicode replacement
+character, \code{U+FFFD}, to be used to replace input characters which
+cannot be decoded. The default behavior is to decode UTF-8 in strict
+mode, meaning that encoding errors raise \exception{ValueError}. See
+also the \refmodule{codecs} module.
\versionadded{2.0}
\end{funcdesc}