Doc corrections
A few corrections in doc/dev.org and doc/admin.org
A GitLab upgrade is scheduled for Monday May 11th. The service will be unavailable from 9 am to 12. We'll keep you posted on the progress of the upgrade on the Mattermost channel: https://mattermost.inria.fr/devel/channels/gitlab. We recommend that you do not work on the platform until an announcement indicates that maintenance is complete.
A few corrections in doc/dev.org and doc/admin.org