Add notification channel info
This is to actualise products 'notification channel information on a guidebook after https://gitlab.developers.cam.ac.uk/uis/devops/docs/general/-/issues/103.
Edited by Dmitrii Unterov
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This is to actualise products 'notification channel information on a guidebook after https://gitlab.developers.cam.ac.uk/uis/devops/docs/general/-/issues/103.