The source project of this merge request has been removed.
Include RE2 in the upgrade docs
What does this MR do?
Includes instructions on installing re2 in the relevant upgrade docs.
It also adds a note on manually installing re2 on Ubuntu Trusty, which doesn't have the libre2-dev package, in the install doc.
Are there points in the code the reviewer needs to double check?
The point releases we introduced re2 in are to be found in this issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/34905
Why was this MR needed?
This helps users upgrading between minor releases who haven't already gone to the latest point release. It may also help some users upgrading to an affected point release.
Screenshots (if relevant)
Related to #35342 (closed)