An independent clean-context audit of the newly-authored gitea-prs skill
flagged that old_line_num/new_line_num (write path, pull_request_review_write
create) and position/old_position (read path, get_review_comments) name the
same concept differently — the same class of write/read field mismatch that
produced the review_scomments typo elsewhere in this domain. Adds one
clarifying sentence to references/reviews.md so an agent skimming only one
side doesn't assume symmetric field names.