message: Typo fix: add missing quote at end of example.
  This just makes examples consistent while bringing in zero additional changes.
  Discovered while working on modular filesystems.
diff: @@ -41,7 +41,7 @@ string JoinPathImpl(std::initializer_list<tensorflow::StringPiece> paths);
  // Usage:
  // string path = io::JoinPath("/mydir", filename);
  // string path = io::JoinPath(FLAGS_test_srcdir, filename);
  -// string path = io::JoinPath("/full", "path", "to", "filename);
  +// string path = io::JoinPath("/full", "path", "to", "filename");
  template <typename... T>
  string JoinPath(const T&... args) {
  return internal::JoinPathImpl({args...});
  