Comment out non-code information

While working on gitlab-org/gitlab-development-kit!3747 (merged), I noticed the following error:

$ make gitlab-eli5-setup

--------------------------------------------------------------------------------
Installing asdf tools from /Users/ash/src/gitlab/gitlab-development-kit/gitlab-eli5/.tool-versions
--------------------------------------------------------------------------------
updating plugin repository...HEAD is now at 8e311ee feat: add dynatrace-monaco plugin (#951)
Plugin named python already added
Plugin named poetry already added
Retrieving Poetry metadata
--snip--

Installing the current project: eli5 (0.1.0)
./setup.sh: line 7: If: command not found
Installation of requirements failed. Please check the error messages above.

This small fix comments out a non-code piece of information and fixes the above error.