updateComment(commentId: string,body: string,requestingUserId: string,canModerate: boolean): { comment: Comment; dump: CommentDump; }
Replaces a comment's body, for PATCH /api/comments/:commentId.
canModerate lets someone other than the author do it. It notifies, in the
author's name, the users it mentions for the first time, unless the dump is
private, and relinks the attachments and backlinks. The route broadcasts the
comment to those who may see its dump.
{ comment: Comment; dump: CommentDump; }