Docs: Improve grammar on `animated-elements.mdx`

[lordofthelake]

Why

Noticed some grammar mistakes in the documentation about creating custom hosts, thought about improving the wording to make the language clearer.

What

Some grammar fixes and light rewording in the documentation to improve readability.

Checklist

• [x] Documentation updated
• [x] Ready to be merged

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Latest commit: be23274f2f02b9b7e46c5c07e363a8243ecd2c80

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Name	Status	Preview	Comments	Updated (UTC)
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