[fancy-text] README typo and grammar fixes

[nexxai]

Description

Just a couple of small typo and grammar fixes in the README

Screencast

n/a

Checklist

• [x] I read the extension guidelines
• [x] I read the documentation about publishing
• [x] I ran npm run build and tested this distribution build in Raycast
• [x] I checked that files in the assets folder are used by the extension itself
• [x] I checked that assets used by the README are placed outside of the metadata folder

[raycastbot]

Thank you for your contribution! :tada:

🔔 @peduarte you might want to have a look.

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[nexxai]

I don't think the changelog CI failure is necessary - I don't think typofixes need to be added to the changelog, do they?

[pernielsentikaer]

We like to tell people what's update 🙂

[github-actions[bot]]

Published to the Raycast Store: https://raycast.com/peduarte/fancy-text

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