[Edit/Update] Python - Collection-Module - defaultdict entry

[KaChunMa]

Description

Enhancement to defaultdict entry to include explanation that the default_factory argument should be a callable, and provide examples of callables other than a custom function being used.

Issue Solved

Not a raised issue last I checked, this is just for clarity and extra information for readers.

Type of Change

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

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.

[CLAassistant]

All committers have signed the CLA.

[mamtawardhani]

looks good for a second review! 🚀