DOC: Grammatically updated the tech docs "Package Overview"
Small grammatical update to the Package Overview


**Location of the documentation**
https://pandas.pydata.org/docs/dev/getting_started/overview.html


![image](https://github.com/pandas-dev/pandas/assets/113131386/a9a5f092-677a-4fc4-b127-35f9daf51c0b)


Thanks @ViswaBonam 