Raphael

In order to clean old PR I have manually pushed all modifications to releases/v23.1 Closing this PR.

Doc parts have been updated already. Closing the PR.

doc up-to-date. Messageboard specifics to be re-tested on v24.

Extract example from the doc to create a DQL recipes by use case. Example :"find movies where at least on actor is playing multiple roles" ... and explain the query...

Could be in "Queries examples" section under DQL

Type has been added to doc through another PR. closing this one.