Added descriptions and examples for font-style.

[SarahCarlock]

Description

Added a description and method example for font-styles' normal, italic, oblique, inherit, and initial. Provided two images showing font-style used in an HTML document and it's output.

Issue Solved

• Closes issue #4416

Type of Change

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

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.

[CLAassistant]

All committers have signed the CLA.

[SarahCarlock]

@ishg-153 I've completed the changes requested.

[github-actions[bot]]

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