Fix typo in undecorate.ts

[eltociear]

targetting -> targeting

Code change checklist

• Added/updated unit tests
• Updated /docs. For new functionality, at least API.md should be updated
• Verified that there is no significant performance drop (yarn mobx test:performance)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 57bcfb2

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[kubk]

Thank you