Cpp variables

[RashmitTopG]

Description

Issue Solved

Closes #5491

Type of Change

FIxed Documentation for C++ Varibales added definitions and codeblocks.

• Adding a new entry
• Editing an existing entry (fixing a typo, bug, issues, etc)
• 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 PR has 3 files. Could you just stage the variables.md file and remove the other files from this branch please?

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