[algorithm.syn] Fix template head formatting (#5786)

Author: hewillk

source/algorithms.tex

@@ -1274,7 +1274,7 @@
       @\exposconcept{indirectly-binary-right-foldable}@<T, iterator_t<R>> F>
       constexpr auto fold_right(R&& r, T init, F f);
 
-    template <@\libconcept{bidirectional_iterator}@ I, @\libconcept{sentinel_for}@<I> S,
+    template<@\libconcept{bidirectional_iterator}@ I, @\libconcept{sentinel_for}@<I> S,
       @\exposconcept{indirectly-binary-right-foldable}@<iter_value_t<I>, I> F>
       requires @\libconcept{constructible_from}@<iter_value_t<I>, iter_reference_t<I>>
     constexpr auto fold_right_last(I first, S last, F f);