quarto docx output: open and resave before sharing

Moved from UCD-SERG/lab-manual#124 (opened by d-morrison on 2026-01-15); it belongs in the Quarto chapter. (The original was assigned to Copilot and had 2 comments; see the link back.)

or else collaborators will get this confusing message when they open the docx (screenshot in the original issue: UCD-SERG/lab-manual#124):

and it will open as "Document 1", and they'll have to re-save the file in order to save comments and track changes