improve wording

exercises/practice/anagram/anagram_test.cpp

@@ -12,8 +12,8 @@ using namespace std;
 
 // Anagram exercise test case data version 1.5.0
 
-// This class is a helper to support any container to be used. It takes
-// an std::unordered_set of expected values and provides a method
+// This class is a helper to allow the solution to return any container type. It
+// takes an std::unordered_set of expected values and provides a method
 // `is_identical_to` that checks if a given container is as expected. Since the
 // method is a method template, it works for any container.
 class ExpectedSet {