doc: document socket send API, including an example

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diff --git a/docs/man/nng_send.3.adoc b/docs/man/nng_send.3.adoc
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-= nng_send(3)
-//
-// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
-// Copyright 2018 Capitar IT Group BV <info@capitar.com>
-//
-// This document is supplied under the terms of the MIT License, a
-// copy of which should be located in the distribution where this
-// file was obtained (LICENSE.txt).  A copy of the license may also be
-// found online at https://opensource.org/licenses/MIT.
-//
-
-== NAME
-
-nng_send - send data
-
-== SYNOPSIS
-
-[source, c]
-----
-#include <nng/nng.h>
-
-int nng_send(nng_socket s, void *data, size_t size, int flags);
-----
-
-== DESCRIPTION
-
-The `nng_send()` function sends a message containing the _data_ of
-length _size_ using the xref:nng_socket.5.adoc[socket] _s_.
-
-NOTE: The semantics of what sending a message means vary from protocol to
-protocol, so examination of the protocol documentation is encouraged.
-(For example, with an xref:nng_pub.7.adoc[_pub_] socket the data is broadcast, so that
-any peers who have a suitable subscription will be able to receive it using
-xref:nng_recv.3.adoc[`nng_recv()`] or a similar function.)
-Furthermore, some protocols may not support sending data (such as
-xref:nng_sub.7.adoc[_sub_]) or may require other conditions.
-(For example, xref:nng_rep.7.adoc[_rep_] sockets cannot normally send data,
-which are responses to requests, until they have first received a request.)
-
-The _flags_ may contain either of (or neither of) the following values:
-
-`NNG_FLAG_NONBLOCK`::
-    The function returns immediately, regardless of whether
-    the socket is able to accept the data or not.  If the socket is unable
-    to accept the data (such as if backpressure exists because the peers
-    are consuming messages too slowly, or no peer is present), then the
-    function will return with `NNG_EAGAIN`.  If this flag is not specified,
-    then the function will block if such a condition exists.
-
-`NNG_FLAG_ALLOC`::
-    The _data_ was allocated using xref:nng_alloc.3.adoc[`nng_alloc()`], or was
-    obtained from a call to xref:nng_recv.3.adoc[`nng_recv()`] with
-    the `NNG_FLAG_ALLOC` flag.
-    If this function returns success, then the _data_ is "owned" by the
-    function, and it will assume responsibility for calling
-    xref:nng_free.3.adoc[`nng_free()`] when it is no longer needed.
-    In the absence of this flag, the _data_ is copied by the implementation
-    before the function returns to the caller.
-
-TIP: The `NNG_FLAG_ALLOC` flag can be used to reduce data copies, thereby
-increasing performance.
-
-NOTE: Regardless of the presence or absence of `NNG_FLAG_NONBLOCK`, there may
-be queues between the sender and the receiver.
-Furthermore, there is no guarantee that the message has actually been delivered.
-Finally, with some protocols, the semantic is implicitly `NNG_FLAG_NONBLOCK`,
-such as with xref:nng_pub.7.adoc[_pub_] sockets, which are best-effort delivery only.
-
-IMPORTANT: When using `NNG_FLAG_ALLOC`, it is important that the value of _size_
-match the actual allocated size of the data.
-Using an incorrect size results
-in unspecified behavior, which may include heap corruption, program crashes,
-or trans-dimensional mutation of the program's author.
-
-== RETURN VALUES
-
-This function returns 0 on success, and non-zero otherwise.
-
-== ERRORS
-
-[horizontal]
-`NNG_EAGAIN`:: The operation would block, but `NNG_FLAG_NONBLOCK` was specified.
-`NNG_ECLOSED`:: The socket _s_ is not open.
-`NNG_EINVAL`:: An invalid set of _flags_ was specified.
-`NNG_EMSGSIZE`:: The value of _size_ is too large.
-`NNG_ENOMEM`:: Insufficient memory is available.
-`NNG_ENOTSUP`:: The protocol for socket _s_ does not support sending.
-`NNG_ESTATE`:: The socket _s_ cannot send data in this state.
-`NNG_ETIMEDOUT`:: The operation timed out.
-
-== SEE ALSO
-
-[.text-left]
-xref:nng_alloc.3.adoc[nng_alloc(3)],
-xref:nng_free.3.adoc[nng_free(3)],
-xref:nng_recv.3.adoc[nng_recv(3)],
-xref:nng_sendmsg.3.adoc[nng_sendmsg(3)],
-xref:nng_strerror.3.adoc[nng_strerror(3)],
-xref:nng_socket.5.adoc[nng_socket(5)],
-xref:nng.7.adoc[nng(7)]