docs: Use SDK4 in tutorial instead of SDK3
docs: Use SDK4 in tutorial instead of SDK3

The next chapter of the tutorial will be written for the new stable API.

https://phabricator.endlessm.com/T16018

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib