Update one incorrect PR number in changelog

[rmunn]

Because of how #4345 was merged into #4344, the script that automatically adds PR numbers to the changelog got the wrong PR number for the "Expose event.routeId and page.routeId" feature. This manual change to the CHANGELOG.md file fixes that minor error.

No changeset included, for obvious reasons.

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Latest commit: 8c5f280

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