Update RELEASENOTES.md

[alex-clickhouse]

Summary

A short description of the changes with a link to an open issue.

Checklist

Delete items not relevant to your PR:

• Unit and integration tests covering the common scenarios were added
• A human-readable description of the changes was provided to include in CHANGELOG

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Note

Low Risk
Documentation-only change that only affects the release notes text.

Overview
Updates RELEASENOTES.md to correct the version header for the 1.0.0 release notes (replacing the placeholder -v? with v1.0.0).

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