fix: valid simnet mnemonic example

Author: Adrijan-Petek

settings/Simnet.toml.example

@@ -4,4 +4,4 @@ node_rpc_address = "http://localhost:3999"
 deployment_fee_rate = 10
 
 [accounts.deployer]
-mnemonic = "replace with your simnet mnemonic"
+mnemonic = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about"