docs: fixed CLI warning

[hanny24]

CLI warning does not match reality. This PR fixes that.

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[codecov-commenter]

Codecov Report

Merging #647 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #647   +/-   ##
=======================================
  Coverage   81.13%   81.13%           
=======================================
  Files          78       78           
  Lines        5163     5163           
  Branches      130      130           
=======================================
  Hits         4189     4189           
  Misses        974      974           

Impacted Files	Coverage Δ
...ala/com/twilio/guardrail/core/CoreTermInterp.scala	77.67% <100.00%> (ø)

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