aio cancellation docs converted to mdbook

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diff --git a/docs/ref/api/aio/aio_cancel.md b/docs/ref/api/aio/aio_cancel.md
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+= nng_aio_abort(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_aio_abort - abort asynchronous I/O operation
+
+== SYNOPSIS
+
+[source, c]
+----
+#include <nng/nng.h>
+
+void nng_aio_abort(nng_aio *aio, int err);
+----
+
+== DESCRIPTION
+
+The `nng_aio_abort()` function aborts an operation previously started
+with the handle _aio_.
+If the operation is aborted, then the callback
+for the handle will be called, and the function
+xref:nng_aio_result.3.adoc[`nng_aio_result()`] will return the error _err_.
+
+This function does not wait for the operation to be fully aborted, but
+returns immediately.
+
+If no operation is currently in progress (either because it has already
+finished, or no operation has been started yet), then this function
+has no effect.
+
+== RETURN VALUES
+
+None.
+
+== ERRORS
+
+None.
+
+== SEE ALSO
+
+[.text-left]
+xref:nng_aio_alloc.3.adoc[nng_aio_alloc(3)],
+xref:nng_aio_cancel.3.adoc[nng_aio_cancel(3)],
+xref:nng_aio_result.3.adoc[nng_aio_result(3)],
+xref:nng_aio.5.adoc[nng_aio(5)],
+xref:nng.7.adoc[nng(7)]
diff --git a/docs/ref/api/aio/index.md b/docs/ref/api/aio/index.md
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+# Asynchronous I/O Operations