Remove obsolete comment in UnorderedEquals vector matcher

src/catch2/matchers/catch_matchers_vector.hpp

@@ -140,8 +140,6 @@ namespace Matchers {
             m_target(target)
         {}
         bool match(std::vector<T, AllocMatch> const& vec) const override {
-            // Note: This is a reimplementation of std::is_permutation,
-            //       because I don't want to include <algorithm> inside the common path
             if (m_target.size() != vec.size()) {
                 return false;
             }