Update copiloting-service.md

[HelenCEBM]

clarify authorship policy

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[HelenCEBM]

Associated changes made to the linked spreadsheet here: https://docs.google.com/spreadsheets/d/1-piPlxWtp1RbhQ5l7AGPrE8nLTzDIavPB1MG9bZPBfM/edit#gid=0 (Added the collaborative, changed tech team to "tech team representative" and added a note to ask copilot for details)

[evansd]

I note from a Slack comment earlier today that there's been some recent discussion of authorship policy so I assume any necessary changes will get made to the docs soon anyway.

Going to close this for now.