Fix typos in the css-prop.mdx

[georgekaran]

I was going through the official documentation and found some small typos in the css-prop.mdx file.

What: Fix small typos in the css-prop.mdx

Why: The typos are small and easy to fix.

How: Fixing the typos in the css-prop.mdx file.

Checklist:

• Documentation
• Tests
• Code complete
• Changeset

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Latest commit: 6c7f625

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