Add .b2a_uu() entry

[runaroundontheground]

Description

Added an entry to the binascii module on .b2a_uu(). Motivation is to complete Codecademy's Git and Github course. File path is docs/content/python/concepts/binascii-module/terms/b2a-uu/b2a-uu.md.

Issue Solved

Closes #4554

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.

[github-actions[bot]]

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