Improve project module documentation
Improvements to the project module documentation to bring it into line with the documentation guidelines: https://www.tryton.org/develop/guidelines/documentation
This instance will be upgraded to Heptapod 1.3.3 (GitLab 16.9.6) on 2023-04-25 at 18:00 UTC+2
Improvements to the project module documentation to bring it into line with the documentation guidelines: https://www.tryton.org/develop/guidelines/documentation