datadog-setup.php: fix and improve wording appsec settings descs

[cataphract]

Description

Reviewer checklist

• [ ] Test coverage seems ok.
• [ ] Appropriate labels assigned.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 75.31%. Comparing base (5c8a742) to head (5992bbf). Report is 3 commits behind head on master.

Additional details and impacted files

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[iamluc]

Also, I think you need to rebase on top of master to fix some CI failures