[boostbook] class free-function-group synopsis patch

Attached is a one-line patch that prevents a class' associated free functions 
(a "free-function-group" element inside a "class" element) from reappearing 
in the synopsis of member classes.  That is, for something like

<class name="A">
  <class name="AMemberClass"/>
  <free-function-group name="A's free functions"/>
</class>

"A's free functions" will currently appear both in the synopsis of class "A" 
and the synopsis of class "AMemberClass".  This patch prevents them from 
appearing in the synopsis of "AMemberClass".

I'll commit the change to svn in a few days if I don't hear any objections.

--

-- 
Frank

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