Changed layout to match boost

doc/patterns.qbk

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+[/
+ / Copyright (c) 2014 Mathieu Champlon
+ /
+ / Distributed under the Boost Software License, Version 1.0. (See accompanying
+ / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+ /]
+
+[section Patterns]
+[import example/patterns_async_call.cpp]
+[import example/patterns_retrieve_cref.cpp]
+[import example/patterns_invoke_functor.cpp]
+[import example/patterns_quick_constraint.cpp]
+
+This section highlights not-so-obvious features of the library gathered from real use cases.
+
+[section Waiting for an asynchronous call]
+
+Problem :
+
+[async_call_problem]
+
+Solution :
+
+[async_call_solution]
+
+[endsect]
+
+[section Retrieving an argument to use in a later constraint]
+
+Problem :
+
+[retrieve_cref_problem]
+
+Solution :
+
+[retrieve_cref_solution]
+
+[endsect]
+
+[section Invoking a functor received as parameter]
+
+Problem :
+
+[invoke_functor_problem]
+
+Solution :
+
+[invoke_functor_solution]
+
+[endsect]
+
+[section Quickly writing a custom constraint for a serializable type]
+
+Problem :
+
+[quick_constraint_problem]
+
+Solution :
+
+[quick_constraint_solution]
+
+[endsect]
+
+[endsect]