fix thsi docstring typo

[graingert]

No description provided.

[codecov]

Codecov Report

Merging #114 (d7395e9) into master (308dd76) will decrease coverage by 51.96%.
Report is 16 commits behind head on master.
The diff coverage is n/a.

❗ Current head d7395e9 differs from pull request most recent head c1bafb9. Consider uploading reports for the commit c1bafb9 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #114       +/-   ##
===========================================
- Coverage   82.23%   30.27%   -51.96%     
===========================================
  Files          11       11               
  Lines        1199     1199               
  Branches      175      193       +18     
===========================================
- Hits          986      363      -623     
- Misses        151      832      +681     
+ Partials       62        4       -58     

Files	Coverage Δ
trio_asyncio/_base.py	25.93% <ø> (-58.22%)	⬇️

... and 8 files with indirect coverage changes

[CoolCat467]

Looks good, not sure why a bunch of the tests failed though