Remove the free-function-groups from the hash reference documentation, they were causing the functions to be listed on the documentation for every specialization of boost::hash<T>, and the functions to be described on the main synopsis page, instead of their own page.

[SVN r40101]

doc/portability.qbk

@@ -10,7 +10,7 @@
 __boost_hash__ is written to be as portable as possible, but unfortunately, several
 older compilers don't support argument dependent lookup (ADL) - the mechanism
 used for customisation.  On those compilers custom overloads for `hash_value`
-need to be declared in the boost namespace.
+needs to be declared in the boost namespace.
 
 On a strictly standards compliant compiler, an overload defined in the
 boost namespace won't be found when __boost_hash__ is instantiated,

doc/ref.xml

@@ -406,8 +406,6 @@ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
         </method>
       </struct-specialization>
 
-      <free-function-group name="Support functions (Boost extension).">
-
       <!--
         boost::hash_combine
         -->
@@ -502,10 +500,6 @@ for(; first != last; ++first)
         </para></throws>
       </overloaded-function>
 
-      </free-function-group>
-
-      <free-function-group name="Overloadable hash implementation (Boost extension).">
-
       <!--
         boost::hash_value - integers
         -->
@@ -803,7 +797,6 @@ return seed;</programlisting></entry>
           </informaltable>
         </returns>
       </overloaded-function>
-      </free-function-group>
     </namespace>
   </header>
 </library-reference>