Document the usage of populate in the case of multiple nested fields to populate

[iDommel]

It would be nice to have a few lines of documentation showing that you should use spaces when you want to populate multiple nested fields.

When you have a request that looks like:
/orders/${id}?populate=quotation.customer,quotation.quotlines,movements

you end up with a populate object that looks like:
population [ { path: 'quotation', populate: { path: 'quotlines' } }, { path: 'movements' } ]
Instead of :
population [ { path: 'quotation', populate: [{ path: 'quotlines' }, { path: 'customer' }] }, { path: 'movements' } ]

The solution to that is that your request should be made using spaces for consecutive fields from the same key, like so:
/orders/${id}?populate=quotation.customer quotlines,movements

That solution was provided by a veteran user from my team, but it would be nice for it to be documented in the readMe in the populate section.