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

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

source/discussions/single_source_version.rst

@@ -45,6 +45,3 @@ The following are links to some build system's documentation for handling versio
 * `Setuptools <https://setuptools.pypa.io/en/latest/userguide/distribution.html#specifying-your-project-s-version>`_
 
   -  `setuptools_scm <https://setuptools-scm.readthedocs.io/en/latest/>`_
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