[DEV] add v1.76.0

libs/optional/doc/html/boost_optional/tutorial/gotchas.html

@@ -1,6 +1,6 @@
 <html>
 <head>
-<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>Gotchas</title>
 <link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css">
 <meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
@@ -37,7 +37,7 @@
         </p>
 <p>
           First, it is functionally similar to a tristate boolean (false, maybe,
-          true) &#8212;such as <a href="../../../../../../doc/html/tribool.html" target="_top">boost::tribool</a>&#8212;
+          true) —such as <a href="../../../../../../doc/html/tribool.html" target="_top">boost::tribool</a>—
           except that in a tristate boolean, the maybe state <span class="underline">represents
           a valid value</span>, unlike the corresponding state of an uninitialized
           <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="keyword">bool</span><span class="special">&gt;</span></code>.
@@ -98,8 +98,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright &#169; 2014-2017 Andrzej
-      Krzemie&#324;ski<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
         Distributed under the Boost Software License, Version 1.0. (See accompanying
         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
       </p>