Update methods.md

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Description

A few examples added to the https://www.codecademy.com/resources/docs/javascript/methods page to supplement the exercise on the https://www.codecademy.com/courses/introduction-to-javascript/lessons/arrays/exercises/more-array-methods Introduction to Javascript page.

Issue Solved

More examples added

Type of Change

(sorry this is my first pull request, please have patience with me if I am wrong)

• Adding a new entry
• Updating the documentation

Checklist

• [ X ] All writings are my own. (with some assistance from Gemini 3.0 and GPT 5.2)
• [ ] 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.
• 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.
• [ X ] I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.