Discussion of signatures for unicode.translate() and str.translate()
were in the wrong file.  Moved out of libstring.tex and into
libstdtypes.tex.
diff --git a/Doc/lib/libstdtypes.tex b/Doc/lib/libstdtypes.tex
index 2b64d89..2f01ca6 100644
--- a/Doc/lib/libstdtypes.tex
+++ b/Doc/lib/libstdtypes.tex
@@ -740,6 +740,16 @@
 optional argument \var{deletechars} are removed, and the remaining
 characters have been mapped through the given translation table, which
 must be a string of length 256.
+
+For Unicode objects, the \method{translate()} method does not
+accept the optional \var{deletechars} argument.  Instead, it
+returns a copy of the \var{s} where all characters have been mapped
+through the given translation table which must be a mapping of
+Unicode ordinals to Unicode ordinals, Unicode strings or \code{None}.
+Unmapped characters are left untouched. Characters mapped to \code{None}
+are deleted.  Note, a more flexible approach is to create a custom
+character mapping codec using the \refmodule{codecs} module (see
+\module{encodings.cp1251} for an example).      
 \end{methoddesc}
 
 \begin{methoddesc}[string]{upper}{}