Fix markdown in Doxygen comments for std::reduce

	* include/std/numeric (reduce): Fix Doxygen markup.

From-SVN: r274757

libstdc++-v3/ChangeLog

 2019-08-20  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/std/numeric (reduce): Fix Doxygen markup.
+
 	PR libstdc++/91371
 	* include/std/type_traits (is_function): Simplify definition. Remove
 	partial specializations for function types.

libstdc++-v3/include/std/numeric

@@ -288,7 +288,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
    *  @return  The final sum.
    *
    *  Reduce the values in the range `[first,last)` using addition.
-   *  Equivalent to calling std::reduce(first, last, init, std::plus<>())`.
+   *  Equivalent to calling `std::reduce(first, last, init, std::plus<>())`.
    */
   template<typename _InputIterator, typename _Tp>
     inline _Tp
@@ -304,7 +304,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
    *
    *  Reduce the values in the range `[first,last)` using addition, with
    *  an initial value of `T{}`, where `T` is the iterator's value type.
-   *  Equivalent to calling std::reduce(first, last, T{}, std::plus<>())`.
+   *  Equivalent to calling `std::reduce(first, last, T{}, std::plus<>())`.
    */
   template<typename _InputIterator>
     inline typename iterator_traits<_InputIterator>::value_type