docs(changelog): fix minor typo in Changelog

[jclarkin]

What was done

Spotted and fixed a minor typo in the v7.0.0 changelog:

• Was: introduce din minor releases
• Now: introduced in minor releases

User Impact

No functional impact on users.

Testing

No testing necessary for this PR change - documentation change only.

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Latest commit: 9425b16

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳