PPNA-666 Fix order_by in query example

[janusz-piechota-piwik]

https://developers.piwik.pro/en/latest/custom_reports/http_api/http_api.html#tag/Queries order_by
Array of arrays

Array of sorting directives. Each directive is a 2-element array with 0-based colum index and direction). You can sort on more than one column. By default sorts descending by the first metric in query.

[kororokke]

Let's add it to upcoming version... not master. Master branch should not be target for this kinds of PRs, ok? ;)

[kororokke]

I tried to change the base, but well, changes from master are bigger atm.

[kororokke]

Fiiiiiiiiiiiine

[kororokke]

Merge it then. I didn't see a thing.