message: Fix documentation error
  Move comparison before "j.clear()" function call, such that the intended return value "true" is actually correct.
diff: @@ -263,6 +263,9 @@ const std::string tmp = j[0];
  j[1] = 42;
  bool foo = j.at(2);
  +// comparison
  +j == "[\"foo\", 1, true]"_json; // true
  +
  // other stuff
  j.size(); // 3 entries
  j.empty(); // false
  @@ -277,9 +280,6 @@ j.is_object();
  j.is_array();
  j.is_string();
  -// comparison
  -j == "[\"foo\", 1, true]"_json; // true
  -
  // create an object
  json o;
  o["foo"] = 23;
  