message: docs: Mention Rinkeby in the testnet docs
diff: @@ -62,7 +62,7 @@ indexer. The only requirement is a minimum stake of 100k GRT.
  | `ethereum` | `--ethereum-rpc` | `mainnet:...` |
  | `ipfs` | `--ipfs` | `https://ipfs.network.thegraph.com` |
  -## Testnet (https://testnet.thegraph.com/)
  +## Testnet (https://testnet.thegraph.com/, Rinkeby)
  ### Registration / Funding (GRT)
  