Doc: Journey param update
Doc: add section on tags
Doc: Add TODOs in the doc

still lots of stuff to add for monday...
Documentation in progress
Documentation: changing urls

and removing useless field
Documentation: typo corrections
Documentation: corrections after reviews
Doc: corrections after review
Documentation: add forgetten param

and add more examples
Documentation: add default value
Doc: add examples
Merge pull request #392 from antoine-de/doc_update

Doc update