Update log endpoint docs to clarify when logs are available

[MrCreosote]

Fixes #544

[MrCreosote]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.32%. Comparing base (e7978a1) to head (f6c7c82).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #548   +/-   ##
=======================================
  Coverage   53.32%   53.32%           
=======================================
  Files          69       69           
  Lines        5909     5909           
=======================================
  Hits         3151     3151           
  Misses       2758     2758           

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[dauglyon]

lgtm!