Update ProtectedReleases.feature

Added the case of unembargoed and not filtered for completeness.
Noted that in some cases although detections are visible, the data is sanitised (species and receiver data removed)
Add note explaining what "sanitised" means
Clarified wording in 'protection level' examples
Merge pull request #118 from aodn/protected_species_doc_update

Update ProtectedReleases.feature