Remove obsolete todo

src/catch2/matchers/catch_matchers_container_properties.hpp

@@ -17,7 +17,6 @@ namespace Catch {
 
         class IsEmptyMatcher final : public MatcherGenericBase {
         public:
-            // todo: Use polyfills
             template <typename RangeLike>
             bool match(RangeLike&& rng) const {
 #if defined(CATCH_CONFIG_POLYFILL_NONMEMBER_CONTAINER_ACCESS)