docs: fix nonexistent query_processed_rows metric (should be query_returned_rows)

[claudespice]

Summary

Deployment guides across many connectors list a Spice query-execution metric named query_processed_rows under runtime.metrics. No such metric exists. The runtime's query telemetry defines:

• query_processed_bytes (u64 counter)
• query_returned_bytes (u64 counter)
• query_returned_rows (u64 histogram) ← the actual rows metric
• query_duration_ms (f64 histogram)
• query_failures (u64 counter; exported as query_failures_total)

Source: crates/runtime/src/metrics/telemetry/mod.rs:59-99 and crates/runtime-metrics/src/telemetry/mod.rs:59-99 (.u64_histogram("query_returned_rows") at line 85). A repo-wide grep for query_processed_rows returns no instrument — the only processed_rows match is the unrelated dataset_acceleration_refresh_processed_rows.

This corrects query_processed_rows → query_returned_rows everywhere it appears.

What changed

Replaced the fabricated query_processed_rows with the real query_returned_rows in all deployment/monitoring sections. Affected connectors/catalogs: s3, dremio, delta-lake, spiceai, cosmosdb, elasticsearch, github, graphql, https, duckdb, file, and the unity-catalog catalog page. Propagated across vNext + version-2.0.x + version-2.1.x (36 files).

Source PRs

• Verified against spiceai/spiceai at trunk: crates/runtime/src/metrics/telemetry/mod.rs (metric definitions).

Test plan

• grep -rn query_processed_rows website/ → 0 hits after fix
• Pure inline-code token rename; no links, tags, or frontmatter changed (Docusaurus link/tag validation unaffected). Local npm run build not run in this environment (no node_modules; full versioned build is memory-constrained) — CI Deploy check is the authoritative link/tag gate for this prose-only diff.
• Files updated: 36 (1 unversioned set + version-2.0.x + version-2.1.x)

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Please address these issues and update your pull request.

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