Give StringAppendF a C++ style name string::AppendF

searching-in-c++-namespace.cc

#include <iostream>

namespace strings {
void Print() {
  std::cout << "strings::Print" << std::endl;
}
}  // namespace strings

namespace uses {
namespace detail {
void Log() {
  strings::Print();  // My point is here!
}
}  // namespace detail
}  // namespace uses

int main() {
  uses::detail::Log();
  return 0;
}