Add cpp unordered sets end term

[dejongbaba]

Description

[Term Entry] C++ Unordered sets end function: end()

Issue Solved

Closes #8025

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.
• 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.

[CLAassistant]

All committers have signed the CLA.

[mamtawardhani]

Hey @dejongbaba, can you please remove the file querySelectorAll.md from this branch?

The other file looks good!

[dejongbaba]

Hi @mamtawardhani, thank you for the revision.

As regards your comment, from my last commit I reverted the changes made to the querySelectorAll.md hence why the file is currently shown as deleted, is there any other approach you want me to take to delete the file? I'm open to your suggestion. It currently shows that the file does not exist in the current branch.

[mamtawardhani]

Okay @dejongbaba, can you please sign the CLA? I'll look into the file

[dejongbaba]

Okay @dejongbaba, can you please sign the CLA? I'll look into the file

done