Merge pull request #319 from m4xG4/static_vector_clear_doc

fixed complexity documentation for static_vector clear

Author: igaztanaga

include/boost/container/static_vector.hpp

@@ -820,7 +820,8 @@ class static_vector
     //!   Nothing.
     //!
     //! @par Complexity
-    //!   Constant O(1).
+    //!   @li If \c is_trivially_destructible<T>::value is \c true Constant O(1).
+    //!   @li If \c is_trivially_destructible<T>::value is \c false Linear O(N).
     void clear()  BOOST_NOEXCEPT_OR_NOTHROW;
 
     //! @pre <tt>i < size()</tt>