Update about.md

Author: wannaphong

_pages/about.md

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 PyThaiNLP Project is a Thai Natural Language Processing project. We build softwares and datasets for Thai language. Our Main Project is PyThaiNLP.
 
-PyThaiNLP is a Python package for text processing and linguistic analysis, similar to NLTK with focus on Thai language. PyThaiNLP starrted at 2017.
+PyThaiNLP is a Python package for text processing and linguistic analysis, similar to NLTK with focus on Thai language. PyThaiNLP started at 2017.
 
 See: [Our Paper](https://aclanthology.org/2023.nlposs-1.4/)