Backport docs for recv_into and recvfrom_into.
diff --git a/Doc/lib/libsocket.tex b/Doc/lib/libsocket.tex
index f510fd4..e5a3c32 100644
--- a/Doc/lib/libsocket.tex
+++ b/Doc/lib/libsocket.tex
@@ -574,6 +574,28 @@
(The format of \var{address} depends on the address family --- see above.)
\end{methoddesc}
+\begin{methoddesc}[socket]{recvfrom_into}{buffer\optional{, nbytes\optional{, flags}}}
+Receive data from the socket, writing it into \var{buffer} instead of
+creating a new string. The return value is a pair
+\code{(\var{nbytes}, \var{address})} where \var{nbytes} is the number
+of bytes received and \var{address} is the address of the socket
+sending the data. See the \UNIX{} manual page
+\manpage{recv}{2} for the meaning of the optional argument
+\var{flags}; it defaults to zero. (The format of \var{address}
+depends on the address family --- see above.)
+\versionadded{2.5}
+\end{methoddesc}
+
+\begin{methoddesc}[socket]{recv_into}{buffer\optional{, nbytes\optional{, flags}}}
+Receive up to \var{nbytes} bytes from the socket,
+storing the data into a buffer rather than creating a new string.
+If \var{nbytes} is not specified (or 0),
+receive up to the size available in the given buffer.
+See the \UNIX{} manual page \manpage{recv}{2} for the meaning of the
+optional argument \var{flags}; it defaults to zero.
+\versionadded{2.5}
+\end{methoddesc}
+
\begin{methoddesc}[socket]{send}{string\optional{, flags}}
Send data to the socket. The socket must be connected to a remote
socket. The optional \var{flags} argument has the same meaning as for