Update aggregator documentation

Author: jpraynaud

docs/website/root/manual/developer-docs/nodes/mithril-aggregator.md

@@ -437,6 +437,7 @@ Here is a list of the available parameters:
 | `snapshot_store_type` | - | - | `SNAPSHOT_STORE_TYPE` | Type of snapshot store to use | - | `gcp` or `local` | :heavy_check_mark: |
 | `snapshot_uploader_type` | - | - | `SNAPSHOT_UPLOADER_TYPE` | Type of snapshot uploader to use | - | `gcp` or `local` | :heavy_check_mark: |
 | `snapshot_bucket_name` | - | - | `SNAPSHOT_BUCKET_NAME` | Name of the bucket where the snapshots are stored  | - | `snapshot-bucket` | :heavy_check_mark: | Required if `snapshot_uploader_type` is `gcp`
+| `snapshot_use_cdn_domain` | - | - | `SNAPSHOT_USE_CDN_DOMAIN` | Use CDN domain for constructing snapshot url  | `false` | - | - | To be used if `snapshot_uploader_type` is `gcp`
 | `run_interval` | - | - | `RUN_INTERVAL` | Interval between two runtime cycles in ms | - | `60000` | :heavy_check_mark: |
 | `era_reader_adapter_type` | `--era-reader-adapter-type` | - | `ERA_READER_ADAPTER_TYPE` | Era reader adapter type that can be `cardano-chain`, `file` or `bootstrap`. | `bootstrap` | - | - |
 | `era_reader_adapter_params` | `--era-reader-adapter-params` | - | `ERA_READER_ADAPTER_PARAMS` | Era reader adapter params that is an optional JSON encoded parameters structure that is expected depending on the `era_reader_adapter_type` parameter | - | - | - |