Add lack of URI and UL validation to .sol docs

[tonimateos]

ACCEPTANCE:

• All sol files that have methods using URIs or UL contain a doc warning that they are not validated, and that responsibility is left to user

[tonimateos]

I created a branch out of the audited commit 16bd9e56d20c206cf927d961c8ec58f299308473

The branch is here, ready to review: https://github.com/freeverseio/laos/tree/feature/docWarnings