[Term Entry] Python Plotly .box()

[minadas482]

Description

• Added a term entry for the plotly.express.box() method.
• The file box.md is located in docs/content/plotly/concepts/express/terms/box/box.md.
• This term entry explains the plotly.express.box() method, giving its syntax and providing examples for better understanding.
• This term entry includes an output image named plotly-express-box()-example.png, which is located in the media folder.

Issue Solved

Closes #4560

Type of Change

• Adding a new entry

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.