[Edit] Python numpy - Added Codebyte example to append function

[selenahuang017]

Description

Edited the Python Numpy append function (/content/numpy/concepts/built-in-functions/terms/append/append.md) to include a Codebyte section

Issue Solved

Closes #5371

Type of Change

• Editing an existing entry (fixing a typo, bug, issues, etc)

Checklist

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

[mamtawardhani]

Thank you for contributing to Codecademy Docs @selenahuang017 😄

The entry looks good for a second round of review 🚀

[dakshdeepHERE]

LGTM 🚀

[github-actions]

👋 @selenahuang017
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