Update the named requirements for reductions to work with rvalues

Author: akukanov

source/elements/oneTBB/source/named_requirements/algorithms/par_reduce_func.rst

@@ -5,20 +5,20 @@
 ==================
 ParallelReduceFunc
 ==================
-**[req.parallel_reduce_body]**
+**[req.parallel_reduce_func]**
 
 A type `Func` satisfies `ParallelReduceFunc` if it meets the following requirements:
 
 -----------------------------------------------------------------------------------------------------
 
 **ParallelReduceFunc Requirements: Pseudo-Signature, Semantics**
 
-.. cpp:function:: Value Func::operator()(const Range& range, const Value& x) const
+.. cpp:function:: Value Func::operator()(const Range& range, Value&& x) const
 
-    Accumulates result for a subrange, starting with initial value ``x``.
-    ``Range`` type must meet the :doc:`Range requirements <range>`.
-    ``Value`` type must be the same as a corresponding template parameter for the
-    :doc:`parallel_reduce algorithm <../../algorithms/functions/parallel_reduce_func>` algorithm.
+    Accumulates values over a subrange, starting with the initial value ``x``.
+    The ``Range`` type must meet the :doc:`Range requirements <range>`.
+    The ``Value`` type must be the same as the corresponding template parameter for the
+    :doc:`parallel_reduce algorithm <../../algorithms/functions/parallel_reduce_func>`.
 
 See also:
 

source/elements/oneTBB/source/named_requirements/algorithms/par_reduce_reduction.rst

@@ -13,11 +13,11 @@ A type `Reduction` satisfies `ParallelReduceReduction` if it meets the following
 
 **ParallelReduceReduction Requirements: Pseudo-Signature, Semantics**
 
-.. cpp:function:: Value Reduction::operator()(const Value& x, const Value& y) const
+.. cpp:function:: Value Reduction::operator()(Value&& x, Value&& y) const
 
-    Combines results ``x`` and ``y``.
-    ``Value`` type must be the same as a corresponding template parameter for the 
-    :doc:`parallel_reduce algorithm <../../algorithms/functions/parallel_reduce_func>` algorithm.
+    Combines the results ``x`` and ``y``.
+    The ``Value`` type must be the same as the corresponding template parameter for the 
+    :doc:`parallel_reduce algorithm <../../algorithms/functions/parallel_reduce_func>`.
 
 See also: