Upgrade path 15.4 to 15.9 suggests 15.6.x but misses 15.7.x as required db migration
The upgrade path in https://docs.gitlab.com/ee/update/index.html#upgrade-paths seems to suggest that
15.x => 15.6.8 => 15.9.x is sufficient.
Community members have reported that upgrading to 15.7.x was required as an intermediate step before 15.9.x
Suggestions:
- Make the upgrade tool suggest the latest required patch release (not 15.6.x or 15.7.x or 15.8.x but instead 15.8.x)
- Do the same for the documentation (which may have a bug here too).