ref: Fix auth token env variable wording in flutter and apple wizards

[Lms24]

Fixes the wording to be more concise regarding setting the auth token env variable.

(I was already opening some PRs for rewording and typo fixes so I figured, I might as well close this issue)

closes #805

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.15%. Comparing base (35fe14d) to head (ca4d94b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #853   +/-   ##
=======================================
  Coverage   51.15%   51.15%           
=======================================
  Files          53       53           
  Lines        3519     3519           
  Branches      816      816           
=======================================
  Hits         1800     1800           
  Misses       1718     1718           
  Partials        1        1           

Flag	Coverage Δ
e2e-tests	80.85% <ø> (ø)
unit-tests	49.91% <ø> (ø)

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[buenaflor]

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