docs: tidy data products table

Use mark-only or word-only rows to match the other comparison tables in the docs, drop the Run it yourself row where every cell was the same, and correct the SDF hosting cells: RPC is testnet and futurenet, Horizon is mainnet, testnet, and futurenet.

Author: hunterpack

docs/data/README.mdx

@@ -14,17 +14,16 @@ SDF maintains four data products. Two are APIs and two are for bulk historical d
 |  | [RPC](./apis/rpc/README.mdx) | [Horizon](./apis/horizon/README.mdx) | [Hubble](./analytics/hubble/README.mdx) | [Galexie](./indexers/build-your-own/galexie/README.mdx) |
 | --- | --- | --- | --- | --- |
 | Type | API | API | Data warehouse | Ledger export tool |
-| Interface | JSON-RPC | REST | SQL (BigQuery) | Files in your data lake |
+| Interface | JSON-RPC | REST | SQL (BigQuery) | XDR files in your data lake |
 | Real-time data | ✅ | ✅ | ❌ | ❌ |
-| Historical data | ❌ About 7 days | ❌ 1 year\* | ✅ Full | ✅ Full |
-| Smart contract data | ✅ | ❌ | ✅ | ✅ Raw |
+| Historical data | About 7 days | 1 year\* | Full | Full |
+| Smart contract data | ✅ | ❌ | ✅ | ✅ |
 | Transaction submission | ✅ | ✅ | ❌ | ❌ |
 | Transaction simulation | ✅ | ❌ | ❌ | ❌ |
-| Curated and parsed data | ❌ | ✅ | ✅ | ❌ Raw XDR |
-| Run it yourself | ✅ | ✅ | ✅ Fork | ✅ |
-| Hosted by SDF | Testnet only | ✅ Deprecating | ✅ Public dataset | ❌\*\* |
+| Curated and parsed data | ❌ | ✅ | ✅ | ❌ |
+| Hosted by SDF | Testnet and futurenet | Mainnet, testnet, and futurenet\* | Public BigQuery dataset | None\*\* |
 
-\*_The SDF-hosted Horizon keeps one year of history. A self-hosted Horizon can serve full history, but Hubble or Galexie are the recommended tools for that._
+\*_The SDF-hosted Horizon keeps one year of history and is nearing end-of-life in favor of RPC. A self-hosted Horizon can serve full history, but Hubble or Galexie are the recommended tools for that._
 
 \*\*_SDF does not host a Galexie data lake, but [several providers](./indexers/build-your-own/galexie/providers.mdx) make public ones available._