URLs can also be webix.proxy objects, not just strings

[dandv]

I've created a snippet illustrating url being a webix.proxy for a DataTable.

Feel free to expand on what types of values the url can take. I've only added webix.proxy because I'm not super familiar with this doc format.

[mafanya23]

In fact, the data source provided as url or within the .load method can be either a string, or a function, or a proxy. We've updated related API

[dandv]

Thanks! Typo: "the logic that is able to get data and parse them on its own" -> "the logic that is able to get data and parse it on its own", or even better, "function to fetch and parse the data into a JavaScript object".