[Term Entry] Userstring Python collection-module

[alessandrocapialbi]

Description

Added the new Term Entry 'UserString' by creating a new directory named 'userstring' under collection-module of the python root. The new file is named userstring.md.

Issue Solved

Closes #7537.

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.

[mamtawardhani]

Hey @alamarnissi , thank you for contributing to Codecademy Docs, the entry is nicely written! 😄

I've suggested a few changes, could you please review and modify those at your earliest convenience? Thank you! 😃

[mamtawardhani]

Looks good for a second review! 🚀