Revert "use utf-8 in doctest"
Revert "use utf-8 in doctest"

This reverts commit 231adfa0164d8fd4bbe9a66529cd9279bc76f39e.

pytype: ImportError: /opt/hostedtoolcache/Python/3.9.8/x64/lib/python3.9/site-packages/typed_ast/_ast3.cpython-39-x86_64-linux-gnu.so: undefined symbol: _PyUnicode_DecodeUnicodeEscape

xflr6/graphviz