Fix typo to be preposition, not verb, in some package comments and documentations

[roygbyte]

What?

Fix typos

Why?

For excellence!

How?

Using ed(1), the standard text editor.

Testing Instructions

Look at the words and see if they make sense.

[github-actions]

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Co-authored-by: t-hamano <wildworks@git.wordpress.org>

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[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @roygbyte! In case you missed it, we'd love to have you join us in our Slack community.

If you want to learn more about WordPress development in general, check out the Core Handbook full of helpful information.

[t-hamano]

Nice catch 👍

[github-actions]

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Kudos!