Cpp enum

[RashmitTopG]

Description

Made Modifications in cpp/enum/enum.md . Added codeblocks and definitions . This PR Closes #5483.

Issue Solved

Type of Change

• Editing an existing entry .
• Updating the documentation .

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.
• [✓] I 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.

[mamtawardhani]

Hey @RashmitTopG, this entry contains files other than enum.md. So, could you please stage only the required file in this branch and unstage the other files?