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

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Author: pre-commit-ci[bot]

docs/contributing.md

@@ -81,6 +81,7 @@ out to the developers of the dependency before the package is released to a wide
 ### Testing the correctness of the plots
 
 Many tests will produce plots and check that they are correct by comparing them with a previously saved and serialized version of the same plots. The ground truth images are located in `tests/_images`. Different OS/versions may produce similar but not identical plots (for instance the ticks/padding could vary). To take into account for this please consider the following:
+
 - you should not use locally generated plots as ground truth images, but you should commit images that have been generated by a GitHub Action. The recommended workflow is to go to the ["actions" page for the repo](https://github.com/scverse/spatialdata-plot/actions/workflows/test.yaml), download the artifacts, and upload them as ground truth (after having reviewed them).
 - the ground truth images need to be updated when a new test is passing, or when a test starts producing a slightly different (but consistent) plot.
 - please never replace the ground truth images without having manually reviewed them.