Updated docstring for from_thread_run to reflect how to get trio token

[oakal510]

Added a documentation fix for the following issue: fixes #1439.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.63%. Comparing base (6f62575) to head (23b2c87).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3001   +/-   ##
=======================================
  Coverage   99.63%   99.63%           
=======================================
  Files         120      120           
  Lines       17798    17798           
  Branches     3198     3198           
=======================================
  Hits        17733    17733           
  Misses         46       46           
  Partials       19       19           

Files	Coverage Δ
src/trio/_threads.py	100.00% <ø> (ø)

[Zac-HD]

Thanks for the fix, @oakal510!

[trio-bot]

Hey @oakal510, it looks like that was the first time we merged one of your PRs! Thanks so much! 🎉 🎂

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