Add CppCon2018 chat server example and video

doc/qbk/02_examples.qbk

@@ -201,6 +201,28 @@ and illustrate the implementation of advanced features.
 
 
 
+[section CppCon 2018]
+
+This talk was given at [@https://cppcon.org CppCon 2018]. In this
+presentation, we develop a multi-user chat server written in C++ using
+Beast WebSocket, which uses a provided chat client written in HTML and
+JavaScript. The source files for this example are located at
+[source_file example/cppcon2018].
+
+
+[block'''
+<mediaobject>
+  <videoobject>
+    <videodata fileref="https://www.youtube.com/embed/7FQwAjELMek"
+        align="center" contentwidth="560" contentdepth="315"/>
+  </videoobject>
+</mediaobject>
+''']
+
+[endsect]
+
+
+
 [section Common Files]
 
 Some of the examples use one or more shared header files, they are

doc/qbk/06_websocket.qbk

@@ -29,13 +29,13 @@ Boost.Asio with a consistent asynchronous model using a modern C++ approach.
     [ws_snippet_1]
 ]
 
-[include 06_websocket/1_streams.qbk]
-[include 06_websocket/2_connect.qbk]
-[include 06_websocket/3_client.qbk]
-[include 06_websocket/4_server.qbk]
-[include 06_websocket/5_messages.qbk]
-[include 06_websocket/6_control.qbk]
-[include 06_websocket/7_teardown.qbk]
-[include 06_websocket/8_notes.qbk]
+[include 06_websocket/01_streams.qbk]
+[include 06_websocket/02_connect.qbk]
+[include 06_websocket/03_client.qbk]
+[include 06_websocket/04_server.qbk]
+[include 06_websocket/05_messages.qbk]
+[include 06_websocket/06_control.qbk]
+[include 06_websocket/07_teardown.qbk]
+[include 06_websocket/08_notes.qbk]
 
 [endsect]

doc/qbk/09_releases.qbk

@@ -9,14 +9,27 @@
 
 [section Release Notes]
 
-
-
 [heading Boost 1.69]
 
+[* New Videos]
+
+[block'''
+<mediaobject>
+  <videoobject>
+    <videodata fileref="https://www.youtube.com/embed/7FQwAjELMek"
+        align="center" contentwidth="448" contentdepth="252"/>
+  </videoobject>
+</mediaobject>
+''']
+
 [* New Features]
 
 * ([issue 1133]) Add `BOOST_BEAST_USE_STD_STRING_VIEW`
 
+[* Examples]
+
+* New WebSocket server and browser-based client: [source_file example/cppcon2018]
+
 [*Fixes]
 
 * ([issue 1245]) Fix a rare case of incorrect UTF8 validation