Add .discard() method.

[BeateBB]

Description

I have created the article about the .discard() method for set objects in Python.
It's my first contribution to GitHub, which I'm currently learning on the Codecademy platform.

Issue Solved

Closes #4612

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 @BeateBB! Thank you for contributing at Codecademy Docs! The entry was well written!

I've suggested some changes in the entry, could you please review and modify those at your earliest convenience? Please feel free to discuss any concerns.
Thank you!

[BeateBB]

Hey, I commited all the changes. I have to improve my knowledge of english) I also suggest to add an article about sets.remove() method to Codecademy Docs and create a link to it.

[mamtawardhani]

Hey @BeateBB, thank you for the suggestion, we will add the issue for .remove() as well.

[mamtawardhani]

Thanks for making the changes @BeateBB!

Looks good for a second review.

[BeateBB]

What check was not successful? Should I do something?

[Sriparno08]

Looks good, @BeateBB! 👍

[github-actions]

👋 @BeateBB
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