docs: remove some old converted content

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diff --git a/docs/man/nng_socket_id.3.adoc b/docs/man/nng_socket_id.3.adoc
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--- a/docs/man/nng_socket_id.3.adoc
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-= nng_socket_id(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_socket_id - return numeric socket identifier
-
-== SYNOPSIS
-
-[source, c]
-----
-#include <nng/nng.h>
-
-int nng_socket_id(nng_socket s);
-----
-
-== DESCRIPTION
-
-The `nng_socket_id()` function returns a positive identifier for the socket _s_,
-if it is valid.
-Otherwise it returns `-1`.
-
-NOTE: A socket is considered valid if it was ever opened with a protocol
-constructor, such as the xref:nng_req_open.3.adoc[`nng_req0_open()`] function.
-Sockets that are allocated on the stack or statically should be
-initialized with the macro
-xref:nng_socket.5.adoc#NNG_SOCKET_INITIALIZER[`NNG_SOCKET_INITIALIZER`]
-to ensure that they cannot be confused with a valid socket before they are opened.
-
-== RETURN VALUES
-
-This function returns the positive value for the socket identifier, or
-`-1` if the socket is invalid.
-
-== ERRORS
-
-None.
-
-== SEE ALSO
-
-[.text-left]
-xref:nng_socket.5.adoc[nng_socket(5)],
-xref:nng.7.adoc[nng(7)]