20260402 doc 15964 grafana dashboards

[peachdawnleach]

Fixes: DOC-15964

Added information about the new cockroach gen dashboard command to the cockroach gen page

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[github-actions]

Files changed:

• src/current/v26.2/cockroach-gen.md

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[github-actions]

Diagram Anchor Check: Passed

All sql-grammar.html#anchor references in SQL diagram files resolve correctly against stmt_block.html.