Lady Dorrian's full statement of reasons in The Spectator's application to vary the terms of the contempt of court order put in the case of HM Advocate v Alex Salmond. https://www.scotcourts.gov.uk/docs/default-source/cos-general-docs/pdf-docs-for-opinions/2021hcj001.pdf?sfvrsn=0
Legal significance of the change to the order? On the face of it: minimal, and intended by the Lord Justice Clerk to be minimal, falling significantly short of the more radical changes sought by the Spectator in its application.
Why does the order particularly matter here? Because Holyrood does not enjoy parliamentary privilege of the kind which applies to Westminster's proceedings. Under the Scotland Act, it is just as much subject to contempt of court orders as you, me, and the media at large.