fix(docs): reference correct cors flag

Documentation/configuration.md

@@ -52,7 +52,7 @@ addr = "127.0.0.1:4001"
 bind_addr = "127.0.0.1:4001"
 ca_file = ""
 cert_file = ""
-cors_origins = []
+cors = []
 cpu_profile_file = ""
 data_dir = "."
 key_file = ""