Fix typo: keep private field as UInt16 in CLS compliance

[yasaminashoori]

Hi 🌹 thanks for your great works.

Summary

Fixed the code in the CLS compliance documentation where the private field was incorrectly changed to Int16.

The documentation states:

"You don't have to change the type of the private personAge field."

However, the code example in public2.cs showed both the private and public members changed to Int16, which contradicts the documentation.

Fix

Changed private Int16 personAge back to private UInt16 personAge .

Fixes issue: #49691