docs: AIO chapter (consumer only) converted to mdbook.

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diff --git a/docs/man/nng_aio_busy.3.adoc b/docs/man/nng_aio_busy.3.adoc
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-= nng_aio_busy(3)
-//
-// Copyright 2022 Staysail Systems, Inc. <info@staysail.tech>
-//
-// 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_aio_busy - test if asynchronous I/O is busy
-
-== SYNOPSIS
-
-[source, c]
-----
-#include <nng/nng.h>
-
-bool nng_aio_busy(nng_aio *aio);
-----
-
-== DESCRIPTION
-
-The `nng_aio_busy()` function returns true if the
-_aio_ is currently busy performing an asynchronous I/O
-operation or is executing a completion callback.
-
-If no operation has been started, or the operation has
-been completed or canceled, and any callback has been
-executed, then it returns false.
-
-This is the same test used internally by
-xref:nng_aio_wait.3.adoc[`nng_aio_wait()`]
-
-NOTE: Care should be taken to ensure that the _aio_ object is not
-freed when using this function.  The caller is responsible for
-coordinating any use of this with any reuse of the _aio_.
-
-== RETURN VALUES
-
-True if the _aio_ is busy, false otherwise.
-
-== ERRORS
-
-None.
-
-== SEE ALSO
-
-[.text-left]
-xref:nng_aio_abort.3.adoc[nng_aio_abort(3)],
-xref:nng_aio_alloc.3.adoc[nng_aio_alloc(3)],
-xref:nng_aio_wait.3.adoc[nng_aio_wait(3)],
-xref:nng_aio.5.adoc[nng_aio(5)],
-xref:nng.7.adoc[nng(7)]