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, 50 insertions, 0 deletions

diff --git a/docs/man/nng_http_req_set_method.3http.adoc b/docs/man/nng_http_req_set_method.3http.adoc
new file mode 100644
index 00000000..786cc071
--- /dev/null
+++ b/docs/man/nng_http_req_set_method.3http.adoc
@@ -0,0 +1,50 @@
+= nng_http_req_set_method(3http)
+//
+// 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_req_set_method - set HTTP request method
+
+== SYNOPSIS
+
+[source, c]
+-----------
+#include <nng/nng.h>
+#include <nng/supplemental/http/http.h>
+
+int nng_http_req_set_method(nng_http_req *req, const char *method);
+-----------
+
+== DESCRIPTION
+
+The `nng_http_req_set_method()` sets the HTTP method associated with
+the request _req_ to _method_.  The _method_ must be a string,
+such as "GET" or "POST", and the HTTP specifications indicate that it must
+be upper case.
+
+The default value method for newly allocated requests is "GET".
+
+A local copy of the _method_ is made in the request _req_.
+
+== RETURN VALUES
+
+This function returns 0 on success, and non-zero otherwise.
+
+== ERRORS
+
+`NNG_ENOMEM`:: Insufficient memory to perform the operation.
+`NNG_ENOTSUP`:: No support for HTTP in the library.
+
+== SEE ALSO
+
+<<nng_http_req_alloc.3http#,nng_http_req_alloc(3http)>>,
+<<nng_http_req_get_method.3http#,nng_http_req_get_method(3http)>>,
+<<nng.7#,nng(7)>>