[Term Entry] Python:NumPy Math Methods: .arctan()

[Sriparno08]

Description

Added a new term entry on the .arctan() method in NumPy.

Issue Solved

Closes #4719

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.

[SaviDahegaonkar]

Hey @Sriparno08,
The entry is nicely written. Thank you for contributing to Codecademy Docs! I have suggested a few changes please make them so I can merge this PR.

Thanks,
Savi

[SaviDahegaonkar]

Suggested change

	In NumPy, the **`.arctan()`** method calculates the inverse tangent of the elements in an [array](https://www.codecademy.com/resources/docs/numpy/ndarray).
	In NumPy, the **`.arctan()`** method calculates the inverse tangent of the elements in an [array](https://www.codecademy.com/resources/docs/numpy/ndarray).

Please extend this introduction.

[Sriparno08]

Made the suggested changes, @SaviDahegaonkar.