Modified comments on upper.py (#3884)

* Modified comments on upper.py ,made it more clean

* Update strings/upper.py

Co-authored-by: xcodz-dot <71920621+xcodz-dot@users.noreply.github.com>

* Update upper.py

* Update upper.py

Co-authored-by: xcodz-dot <71920621+xcodz-dot@users.noreply.github.com>
Co-authored-by: Dhruv Manilawala <dhruvmanila@gmail.com>