trivial: Formatting in default fixture loop scope message

[JayBazuzi]

This message is long and a bit difficult to read; a little formatting can make it easier to read.

[webknjaz]

@JayBazuzi looks like you'll have to re-flow the paragraph now.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.64%. Comparing base (bfd1ca5) to head (3a61060).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1298   +/-   ##
=======================================
  Coverage   93.64%   93.64%           
=======================================
  Files           2        2           
  Lines         409      409           
  Branches       44       44           
=======================================
  Hits          383      383           
  Misses         20       20           
  Partials        6        6           

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