[RFR] ·Add documentation on the data returned from create requests

[cuococarlos]

closes #2087

[djhi]

Thank you for contributing! However, as @fzaninotto said in the linked issue (#2087), we don't want to make this change now as it will be a breaking one and it is easy to implement your own data provider.

I apologize as my last comment on this issue missed the word documentation. Indeed, we only want to make those data providers behavior regarding CREATE clearer. I updated this comment accordingly

[cuococarlos]

Ok.Tomorrow, i will write documentation in another pr and close this.

[cuococarlos]

I added the documentation on this topic. but I do not know if it will be necessary to add it in another document too

[fzaninotto]

Thanks!