[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

docs/source/tox.rst

@@ -159,7 +159,7 @@ This option has no effect if ``pytest`` is ``false``.
 coverage
 ^^^^^^^^
 
-A space separated list of coverage providers to upload to, either 
+A space separated list of coverage providers to upload to, either
 ``codecov`` or ``github``. Default is to not upload coverage
 reports.