.Net: comments and var name inconsistent with source

[ebCrypto]

Motivation and Context

Please help reviewers and future users, providing the following information:

1. Why is this change required?
   comment and variable name are inconsistent with actual code
2. What problem does it solve?
   readability
3. What scenario does it contribute to?
   Step8 of the Getting started test cases
4. If it fixes an open issue, please link to the issue here.

Description

This is a cosmetic change to improve the consistency of the code base and its comment/var names

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄