docs(changelog): correct the 2.3.0 upgrade-notes summary

[coderdan]

The [2.3.0] Upgrade notes paragraph said "Six numbered notes cover … (U-006)" — but v2.3 has eight. U-007 (typed -> selector lookup) and U-008 (typed stevec_query containment) were added by #223 and are already referenced by the section's own Added entries, so the summary contradicted itself.

Also drops the mention of the removed fused eql_v2.hmac_256(col, '<selector>') recipe from the U-004 summary.

CHANGELOG-only; needed before tagging eql-2.3.0 since this section is the release body.

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