[algorithm.syn,alg.swap] Add missing \libconcept for input_range (#5554)

Author: hewillk

source/algorithms.tex

@@ -1318,7 +1318,7 @@
       requires @\libconcept{indirectly_swappable}@<I1, I2>
       constexpr swap_ranges_result<I1, I2>
         swap_ranges(I1 first1, S1 last1, I2 first2, S2 last2);
-    template<@\libconcept{input_range}@ R1, input_range R2>
+    template<@\libconcept{input_range}@ R1, @\libconcept{input_range}@ R2>
       requires @\libconcept{indirectly_swappable}@<iterator_t<R1>, iterator_t<R2>>
       constexpr swap_ranges_result<borrowed_iterator_t<R1>, borrowed_iterator_t<R2>>
         swap_ranges(R1&& r1, R2&& r2);
@@ -4808,7 +4808,7 @@
   requires @\libconcept{indirectly_swappable}@<I1, I2>
   constexpr ranges::swap_ranges_result<I1, I2>
     ranges::swap_ranges(I1 first1, S1 last1, I2 first2, S2 last2);
-template<@\libconcept{input_range}@ R1, input_range R2>
+template<@\libconcept{input_range}@ R1, @\libconcept{input_range}@ R2>
   requires @\libconcept{indirectly_swappable}@<iterator_t<R1>, iterator_t<R2>>
   constexpr ranges::swap_ranges_result<borrowed_iterator_t<R1>, borrowed_iterator_t<R2>>
     ranges::swap_ranges(R1&& r1, R2&& r2);