jsonServerProvider (ra-data-json-server) misleading documentation

[newfylox]

Is your feature request related to a problem? Please describe.
At first, when using jsonServerProvider, I thought the getMany documentation was doing multiple GET calls as mentioned
getMany | GET http://my.api.url/posts/123, GET http://my.api.url/posts/456, GET http://my.api.url/posts/789

In fact, it uses query-string and it produces one call like this
GET http://my.api.url/posts?id=1&id=2&id=3

Describe the solution you'd like
Two things are wrong in the documentation. First, it assumes it calls GET multiple times and it's a "filter" query (?), not a controller action query (/).
Right now I've cloned the repository and I added { arrayFormat: "bracket" } as an option to stringify function to fit my API.

Is it possible to update the documentation? Thanks

[wangzuo]

I guess it should be { arrayFormat: "bracket" } by default.

[dannyxu2015]

I guess it should be { arrayFormat: "bracket" } by default.

No, it's not default