Please have a look at this online installation guide for V 7.1
I took a look and that guide still does not mention GitLab SaaS, and instead mentions:
GitLab: Latest version (with backward compatibility to GitLab 11)
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Kickstart your first data integration and ETL projects.
Part 2 of a series on Context Variables
Learn how to do cool things with Context Variables
Find out how to migrate from one database to another using the Dynamic schema