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

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CONTRIBUTING.md

@@ -6,7 +6,7 @@ Welcome to [TheAlgorithms/Python](https://github.com/TheAlgorithms/Python)! Befo
 
 ## Contributing
 
-### Contributor 
+### Contributor
 
 We are delighted that you are considering implementing algorithms and data structures for others! This repository is referenced and used by learners from all over the globe. By being one of our contributors, you agree and confirm that: