fix: update advanced-configuration.md (#104)

Author: juanmardefago

docs/graphcast/radios/subgraph-radio/advanced-configuration.md

@@ -9,7 +9,7 @@ In the configuration table below is the full list of environment variables you c
 See [Basic Configuration in the Introduction](intro#basic-configuration). The following environment variables are optional:
 
 | Name (Optional variables)            | Description and examples                                                                                                                                                                                                                                                             |
-| ------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | --- | -------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| ------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
 | `MNEMONIC`                           | Mnemonic to the Graphcast ID wallet or the Indexer Operator wallet (first address of the wallet is used; Only one of `PRIVATE_KEY` or `MNEMONIC` is needed). Example: `claptrap armchair violin...`                                                                                  |
 | `COLLECT_MESSAGE_DURATION`           | Seconds that the Subgraph Radio will wait to collect remote POI attestations before making a comparison with the local POI. Example: `120` for 2 minutes.                                                                                                                            |
 | `GOSSIP_TOPIC_COVERAGE`              | Toggle for topic coverage level. Possible values: "comprehensive", "on-chain", "minimal". Default is set to "comprehensive" coverage.                                                                                                                                                |