review text cleaning

[kristofmaar]

• https://medium.com/@datascientist_SheezaShabbir/text-cleaning-in-nlp-libraries-techniques-and-how-to-get-started-8c7c7e8ba7cf
• https://spotintelligence.com/2023/09/18/top-20-essential-text-cleaning-techniques-practical-how-to-guide-in-python/

[kristofmaar]

Current text cleaning methods are fine.