SYSMOAS_ — Description of deletion in createCommit row seems wrong

The spec says: "DataVersion.identity should be populated with the DataIdentity that will be deleted in the new commit. When a DataIdentity is deleted in a commit, all its versions (DataVersion) are also deleted,"

This sounds wrong - presumably DataVersions referenced by earlier Commits need to be maintained. This does seem to be the way that the reference implementation behaves.

Deleted element accessible in previous commits

Add a clarification for data deletion in the description of ProjectDataVersioningService.createCommit operation.