link to the codecs page from the "".encode() description.

Doc/lib/libcodecs.tex

@@ -513,7 +513,7 @@ the \function{lookup()} function to construct the instance.
 \class{StreamReader} and \class{StreamWriter} classes. They inherit
 all other methods and attribute from the underlying stream.
 
-\subsection{Standard Encodings}
+\subsection{Standard Encodings\label{standard-encodings}}
 
 Python comes with a number of codecs builtin, either implemented as C
 functions, or with dictionaries as mapping tables. The following table

Doc/lib/libstdtypes.tex

@@ -578,7 +578,8 @@ default string encoding.  \var{errors} may be given to set a different
 error handling scheme.  The default for \var{errors} is
 \code{'strict'}, meaning that encoding errors raise a
 \exception{ValueError}.  Other possible values are \code{'ignore'} and
-\code{'replace'}.
+\code{'replace'}.  For a list of possible encodings, see
+section~\ref{standard-encodings}.
 \versionadded{2.0}
 \end{methoddesc}