Fix license relationship type

As there were changes in relationship type names in #548, documentation needed to be updated as well:
- concludedLicense -> hasConcludedLicense (an entry from Core/Vocabularies/RelationshipType)
- declaredLicense -> hasDeclaredLicense (an entry from Core/Vocabularies/RelationshipType)
Also update the old name from 2.3 to its 3.0 equivalence
- licenseComment -> comment (Core/comment)
- see https://spdx.github.io/spdx-spec/v3.0/annexes/diffs-from-previous-editions/#licensecomment
A Lite Profile documentation might need to be updated further
- concludedLicense and declaredLicense are removed from the property list
- No explanation yet about the license relationship in this PR
Kudos to the validator in https://github.com/maxhbr/spdx3ToGraph to help spotting the issue.

spdx / spdx-3-model