Fix typo in why-liquid-oxygen.md

[jakeparis]

Fix typo in Accessibilty heading

Description

Fixes #(issue)

Type of change

• Other (please describe): FIx typo

Is it a breaking change?

• No

How Has This Been Tested?

• unit tests
• e2e tests
• accessibility tests
• tested manually
• other: none

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• New and existing tests pass locally with my changes

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Name	Status	Preview	Comments	Updated (UTC)
liquid	❌ Failed (Inspect)			Oct 25, 2024 9:06pm

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