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

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Author: pre-commit-ci[bot]

docs/source/config_syntax.md

@@ -172,7 +172,7 @@ python -m monai.bundle run -- --help
 The support is provided by [Python Fire](https://github.com/google/python-fire), please
 make sure the optional dependency is installed, for example,
 using `pip install monai[fire]` or `pip install fire`.
-Details on the CLI argument parsing is provided in the 
+Details on the CLI argument parsing is provided in the
 [Python Fire Guide](https://github.com/google/python-fire/blob/master/docs/guide.md#argument-parsing).
 
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