fix: readme eof (ethereum#739)

Author: barnabasbusa

README.md

@@ -503,8 +503,8 @@ network_params:
   eip7594_fork_version: "0x70000038"
 
   # EOF activation fork epoch (EL only fork)
-  # Defaults to null
-  eof_activation_epoch: null
+  # Defaults to None
+  eof_activation_epoch: ""
 
   # Network sync base url for syncing public networks from a custom snapshot (mostly useful for shadowforks)
   # Defaults to "https://snapshots.ethpandaops.io/"

network_params.yaml

@@ -78,6 +78,7 @@ network_params:
   eip7594_fork_epoch: 100000001
   eip7594_fork_version: "0x70000038"
   network_sync_base_url: https://snapshots.ethpandaops.io/
+  eof_activation_epoch: ""
   data_column_sidecar_subnet_count: 128
   samples_per_slot: 8
   custody_requirement: 4