Remove invalid escape sequences from docstrings

[ghost]

Otherwise these get reported as DeprecationWarning.

[codecov[bot]]

Codecov Report

Merging #70 into master will not change coverage by %. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #70   +/-   ##
=======================================
  Coverage   72.66%   72.66%           
=======================================
  Files          11       11           
  Lines        1284     1284           
  Branches      177      177           
=======================================
  Hits          933      933           
  Misses        281      281           
  Partials       70       70           

[pquentin]

Thanks!

[trio-bot[bot]]

Hey @schmir-at-bb, it looks like that was the first time we merged one of your PRs! Thanks so much! :tada: :birthday:

If you want to keep contributing, we'd love to have you. So, I just sent you an invitation to join the python-trio organization on Github! If you accept, then here's what will happen:

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