fix: update .env.example for multichain mode (remove legacy ENVIO_RPC_URL/ENVIO_START_BLOCK)

Author: gisk0

indexer-envio/.env.example

@@ -1,4 +1,12 @@
 # To create or update a token visit https://envio.dev/app/api-tokens
 ENVIO_API_TOKEN="<YOUR-API-TOKEN>"
-ENVIO_RPC_URL="http://34.32.123.41:8545"
-ENVIO_START_BLOCK="60548751"
+
+# Multichain mode — set per-chain RPC endpoints.
+# Do NOT set the generic ENVIO_RPC_URL in multichain mode; it would route all
+# chains to the same endpoint and produce incorrect RPC reads.
+ENVIO_RPC_URL_42220="https://forno.celo.org"
+ENVIO_RPC_URL_143="https://rpc2.monad.xyz"
+
+# Optional start block overrides (defaults are set in EventHandlers.ts)
+# ENVIO_START_BLOCK_CELO="60664500"
+# ENVIO_START_BLOCK_MONAD="60730000"