[Term Entry] Dart: .fold()

[nithin-sudarsan]

Description

New Term entry for Dart List method, fold(). Changes made to the file under the directory docs/content/dart/concept/list/terms/fold/fold.md .

Issue Solved

Closes #4304

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.

[nithin-sudarsan]

@avdhoottt @dakshdeepHERE can you please help me by reviewing this PR or by guiding me on how to proceed, as this is my first time contributing?

[nithin-sudarsan]

Hey @nithin-sudarsan, good entry. I have suggested some changes, please make them.

Hey @avdhoottt, I have made changes as suggested, please Check

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