Add C sharp math function log10() entry

[NGonzalez-ng]

Description

Added documentation for the log10() function, including its purpose, syntax, and examples (including codebyte).
This PR adds a new C# math-functions term entry for log10().

Issue Solved

Closes #7989

Type of Change

• Adding a new entry

Checklist

• All writings are my own.
• My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• have confirmed that I'm pushing from a new branch named after the changes I'm making.
• I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[mamtawardhani]

Looks good for a second review! 🚀

[mamtawardhani]

Hey @NGonzalez-ng, please sign the CLA