Minor documentation updates.

doc/no_exceptions_support.qbk

@@ -1,3 +1,13 @@
+[/
+  Copyright 2004 Pavel Vozenilek
+  Copyright 2014 Peter Dimov
+
+  Distributed under the Boost Software License, Version 1.0.
+
+  See accompanying file LICENSE_1_0.txt
+  or copy at http://boost.org/LICENSE_1_0.txt
+]
+
 [section:no_exceptions_support no_exceptions_support]
 
 [section Authors]
@@ -8,7 +18,22 @@
 
 [section Header <boost/core/no_exceptions_support.hpp>]
 
-Example of use:
+The header `<boost/core/no_exceptions_support.hpp>` defines
+macros for use in code that needs to be portable to environments
+that do not have support for C++ exceptions.
+
+[section Synopsis]
+
+``
+#define BOOST_TRY /*unspecified*/
+#define BOOST_CATCH(x) /*unspecified*/
+#define BOOST_CATCH_END /*unspecified*/
+#define BOOST_RETHROW /*unspecified*/
+``
+
+[endsect]
+
+[section Example Use]
 
 ``
 void foo() {
@@ -58,3 +83,5 @@ void foo() {
 [endsect]
 
 [endsect]
+
+[endsect]