PR changes for isinstance() function markdown

[mattfwilson]

Description

Type of Change

• 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.
• [ / ] Under "Development" on the right, I have linked any issues that are relevant to this PR (write "Closes # in the "Description" above).

[caupolicandiaz]

@mattfwilson First review is complete, please review and update. Tag me when your updates are complete. Thanks

[SSwiniarski]

@mattfwilson, I did a second review and only had one comment.

[SSwiniarski]

@mattfwilson In the interest of getting this merged, I made the edits myself.

[github-actions]

👋 @mattfwilson
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[SSwiniarski]

@mattfwilson congrats on your new entry. Live link is here: https://www.codecademy.com/resources/docs/python/built-in-functions/isinstance

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[mattfwilson]

@SSwiniarski Thanks for your help as well of others who help me through this! This was my first PR so I'm super excited to have officially contributed a tiny piece to Codecademy Docs while also learning more about Git and Python. :)