[Edit] AI Gaussian Activation Function

[jkayk]

Description

• Shortened the description of Gaussian Activation Function to less than 160 characters

• Made grammatical and stylistic improvements

• motivation and context: I want to contribute to open source, build my portfolio, and learn about how AIs work.

Issue Solved

Closes #5427

Type of Change

• Editing an existing entry (fixing a typo, bug, issues, etc)

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.