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

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Author: pre-commit-ci[bot]

docs/api/index.md

@@ -4,7 +4,6 @@
 This project is in active development, and the Python API is subject to change. This documentation serves as reference for developers or those interested in the internals of the project. Pivate methods (i.e., preceding with an underscore) are not included here.
 ```
 
-
 ```{toctree}
 virtualship
 ```