Fix typos from https://svn.boost.org/trac/boost/ticket/9283 and update history.

doc/html/boost_regex/format.html

@@ -22,7 +22,7 @@
 <div class="spirit-nav">
 <a accesskey="p" href="syntax/leftmost_longest_rule.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="format/sed_format.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
 </div>
-<div class="section  boost_regex_format">
+<div class="section">
 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
 <a name="boost_regex.format"></a><a class="link" href="format.html" title="Search and Replace Format String Syntax">Search and Replace Format String Syntax</a>
 </h2></div></div></div>