Document nng_aio_xxx asynchronous I/O API.

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+= nng_aio_get_input(3)
+:doctype: manpage
+:manmanual: nng
+:mansource: nng
+:manvolnum: 3
+:copyright: Copyright 2018 mailto:info@staysail.tech[Staysail Systems, Inc.] + \
+            Copyright 2018 mailto:info@capitar.com[Capitar IT Group BV] + \
+            {blank} + \
+            This document is supplied under the terms of the \
+            https://opensource.org/licenses/MIT[MIT License].
+
+== NAME
+
+nng_aio_set_input - return input parameter
+
+== SYNOPSIS
+
+[source, c]
+-----------
+#include <nng/nng.h>
+
+void *nng_aio_get_input(nng_aio *aio, unsigned int index);
+-----------
+
+== DESCRIPTION
+
+The `nng_aio_get_input()` function returns the value of the input parameter
+previously set at _index_ on _aio_ with the
+<<nng_aio_set_input#,nng_aio_set_input(3)>> function.
+
+The valid values of _index_ range from zero (0) to three (3), as no operation
+currently defined can accept more than four parameters.  (This limit could
+increase in the future.)  If the index supplied is outside of this range,
+or of the input parameter was not previously set, then `NULL` is returned.
+
+== RETURN VALUES
+
+Value previously set, or `NULL`.
+
+== ERRORS
+
+None.
+
+== SEE ALSO
+
+<<nng_aio_alloc#,nng_aio_alloc(3)>>,
+<<nng_aio_get_output#,nng_aio_get_output(3)>>,
+<<nng_aio_set_input#,nng_aio_set_input(3)>>,
+<<nng_aio_result#,nng_aio_result(3)>>,
+<<nng#,nng(7)>>
+
+== COPYRIGHT
+
+{copyright}