fix: Document missing pg_replication_bootstrap_batch_size parameter

The PostgreSQL connector accepts pg_replication_bootstrap_batch_size to
control rows-per-batch during the initial CDC snapshot (default 8192,
max 1048576), but it wasn't documented in either the connector reference
or the CDC feature page.

## Reference
Verified against spiceai/spiceai trunk at f4a5089df:
- ParameterSpec: crates/data-connectors/connector-postgres/src/lib.rs:169-174
- Consumed by: crates/data-connectors/connector-postgres/src/replication.rs:436-441
- Constants: DEFAULT_BOOTSTRAP_BATCH_SIZE=8192, MAX_BOOTSTRAP_BATCH_SIZE=1048576

The parameter was added in source on 2026-05-12 (PR #10789) and is not in
any released tag, so only the unversioned vNext docs need updating.

Author: claudespice

website/docs/components/data-connectors/postgres/index.md

@@ -124,6 +124,7 @@ The following parameters configure PostgreSQL [logical replication](https://www.
 | `pg_replication_initial_snapshot`  | Optional. Whether to take an initial snapshot of existing rows before streaming WAL changes. Default: `true`.                                            |
 | `pg_replication_temporary_slot`    | Optional. If `true`, create a temporary replication slot that is dropped when the Spice process disconnects. Default: `false` (durable slot).            |
 | `pg_replication_status_interval`   | Optional. How often to send StandbyStatusUpdate to Postgres (e.g. `10s`). Default: `10s`.                                                               |
+| `pg_replication_bootstrap_batch_size` | Optional. Number of rows per emitted batch during the initial replication snapshot. Default: `8192`. Maximum: `1048576`.                              |
 
 ## Types
 

website/docs/features/cdc/postgres-replication.md

@@ -131,6 +131,7 @@ All replication-specific parameters live under `params:` on the dataset and star
 | `pg_replication_initial_snapshot`    | `true`                                           | If `true`, take an initial snapshot of the table's existing rows before streaming. Set to `false` if you are pre-seeding the accelerator yourself.                                                     |
 | `pg_replication_temporary_slot`      | `false`                                          | If `true`, the slot is dropped when Spice disconnects. Every restart re-bootstraps.                                                                                                                    |
 | `pg_replication_status_interval`     | `10s`                                            | How often `StandbyStatusUpdate` (LSN acknowledgement) is sent back to Postgres. Lower values free WAL faster; higher values reduce network chatter. Accepts any duration string (`500ms`, `30s`, `2m`). |
+| `pg_replication_bootstrap_batch_size` | `8192`                                          | Rows per emitted batch during the initial-snapshot bootstrap. Larger batches reduce per-batch overhead at the cost of more memory per batch. Maximum: `1048576`.                                       |
 
 All existing `pg_host`, `pg_port`, `pg_user`, `pg_pass`, `pg_db`, `pg_sslmode`, `pg_connection_string` parameters continue to apply — see the [PostgreSQL Data Connector](../../components/data-connectors/postgres) reference.