Fix the title of the BOOST_STRONG_TYPEDEF page

Author: gennaroprota

doc/strong_typedef.html

@@ -10,7 +10,7 @@
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <link rel="stylesheet" type="text/css" href="../../../boost.css">
 <link rel="stylesheet" type="text/css" href="style.css">
-<title>Serialization - BOOST_STATIC_WARNING</title>
+<title>Serialization - BOOST_STRONG_TYPEDEF</title>
 </head>
 <body link="#0000ff" vlink="#800080">
 <table border="0" cellpadding="7" cellspacing="0" width="100%" summary="header">