Fix Template Specialization Index CodeBlock for const in printData (#4446)

src/data/roadmaps/cpp/content/111-templates/101-template-specialization/index.md

@@ -23,7 +23,7 @@ void printData(const T& data) {
 }
 
 template <>
-void printData(const char*& data) {
+void printData(const char* const & data) {
     std::cout << "Specialized template for const char*: " << data << std::endl;
 }
 
@@ -81,4 +81,4 @@ int main() {
 }
 ```
 
-In this example, the `MyPair` template class is partially specialized to provide a different behavior when the second template parameter is of type `int`.
+In this example, the `MyPair` template class is partially specialized to provide a different behavior when the second template parameter is of type `int`.