Add membership commands in comands topic

[fariamg]

Add membership operators at operators topic

Description

Add an topic that describes the uses of membership operators (in and not in). The file in question is \docs\content\python\concepts\operators\operators.md

Issue Solved

#4583
Repaired the lack of membership operators in this topic. This membership operators is useful to check if some object contains another one.

Type of Change

• Adding a new entry
• Updating the documentation

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.

[CLAassistant]

All committers have signed the CLA.

[raditya1117]

Hi @fariamg,
Nice contribution. Could you please review the suggested changes and accordingly accept or reject them?

[avdhoottt]

LGTM!!

[raditya1117]

Looks good to go.