Documentation for ordered_json should show proper use of the parse() function.

[gregmarr]

https://json.nlohmann.me/features/object_order/ shows inserting objects in a particular order, but doesn't show how to properly use the parse() function to get the same result for existing JSON documents.

In particular, it needs to be this:

auto j = nlohmann::ordered_json::parse(text);

and not this:

nlohmann::ordered_json j = json::parse(text);

[gregmarr]

Can't change the labels, should be docs or enhancement or something like that.

[nlohmann]

Done: https://json.nlohmann.me/features/object_order/#notes-on-parsing