add plot term

[msaf9]

Description

Added a new entry for the .plot() function under the Matplotlib.
This entry provides an overview of the function, its syntax, parameters, and examples demonstrating how to create and customize line plots.
The goal is to enhance the Matplotlib documentation by covering one of its most commonly used visualization methods.

Issue Solved

Will close #7808

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.