Cleanup and update docs

doc/qbk/index.xml

@@ -2,14 +2,15 @@
 <!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN" "../../../../tools/boostbook/dtd/boostbook.dtd">
 <!--
   Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
+  Copyright (c) 2019 Krystian Stasiowski (sdkrystian at gmail dot com)
 
   Distributed under the Boost Software License, Version 1.0. (See accompanying
   file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
-  Official repository: https://github.com/vinniefalco/json
+  Official repository: https://github.com/boostorg/fixed_string
 -->
 
-<section id="json.index">
+<section id="fixed_string.index">
   <title>Index</title>
   <index/>
 </section>

doc/qbk/main.qbk

@@ -5,11 +5,11 @@
     Distributed under the Boost Software License, Version 1.0. (See accompanying
     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
-    Official repository: https://github.com/vinniefalco/fixed_string
+    Official repository: https://github.com/boostorg/fixed_string
 ]
 
 [library Boost.FixedString
-    [id json]
+    [id fixed_string]
     [quickbook 1.6]
     [copyright 2016 - 2019 Vinnie Falco]
 	[copyright 2019 Krystian Stasiowski]
@@ -32,6 +32,8 @@
 [template include_file[path][^<'''<ulink url="../../../../'''[path]'''">'''[path]'''</ulink>'''>]]
 [template issue[n] '''<ulink url="https://github.com/boostorg/beast/issues/'''[n]'''">#'''[n]'''</ulink>''']
 
+[def __InputIterator__          [@https://en.cppreference.com/w/cpp/named_req/InputIterator ['InputIterator]]]
+
 [/-----------------------------------------------------------------------------]
 
 [section Introduction]

doc/qbk/quickref.xml

@@ -7,7 +7,7 @@
   Distributed under the Boost Software License, Version 1.0. (See accompanying
   file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
-  Official repository: https://github.com/boostorg/beast
+  Official repository: https://github.com/boostorg/fixed_string
 -->
 
 <informaltable frame="all">