fixes #286 nng_pair0_open (and all others) need man page

fixes #279 consider restructuring man sections

This represents a rather significant rework, and major editing
effort, for the entire set of manual pages.

All of the pages now have a section number in their filename;
this assists in some other tooling, particularly ebook generation
as every link needs to be programmatically modified when combined
into an ebook.

Section 5 is introduced, and populated with pages for the main
types, and all options are now documented.

Numerous errors have been corrected, including rewriting certain
portions such as the header section of the surveyor protocol.

Much work has been done to facilitate index generation, although
certainly more work remains here.

Every internal link within these pages now resolves; there are no
more dead links.  (This is required to generate Kindle format books.)

1 files changed, 0 insertions, 56 deletions

diff --git a/docs/man/nng_http_handler_set_host.adoc b/docs/man/nng_http_handler_set_host.adoc
deleted file mode 100644
index d3e464e3..00000000
--- a/docs/man/nng_http_handler_set_host.adoc
+++ /dev/null
@@ -1,56 +0,0 @@
-= nng_http_handler_set_host(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_http_handler_set_host - set host for HTTP handler
-
-== SYNOPSIS
-
-[source, c]
------------
-#include <nng/nng.h>
-#include <nng/supplemental/http/http.h>
-
-int nng_http_handler_set_host(nng_http_handler *handler, const char *host);
------------
-
-== DESCRIPTION
-
-The `nng_http_handler_set_host()` function is used to limit the scope of the
-_handler_ so that it will only be called when the specified _host_ matches
-the value of the `Host:` HTTP header.
-
-TIP: This can be used to create servers with multiple handlers for virtual
-hosting.
-
-The value of the _host_ can include a colon and port, and should match
-exactly the value of the `Host` header sent by the client.  (Canonicaliztion
-of the host name is performed though.)
-
-TIP: As the server framework does not support listening on multiple
-ports, the port number can be elided.  The matching test only considers
-the hostname or IP address, and ignores any trailing port number.
-
-== RETURN VALUES
-
-This function returns 0 on success, and non-zero otherwise.
-
-== ERRORS
-
-`NNG_ENOMEM`:: Insufficient free memory to perform the operation.
-`NNG_ENOTSUP`:: No support for HTTP in the library.
-
-== SEE ALSO
-
-<<nng_http_handler_alloc#,nng_http_handler_alloc(3)>>,
-<<nng_http_server_add_handler#,nng_http_server_add_handler(3)>>,
-<<nng#,nng(7)>>