SCORU originator is not an operator (#351)

* SCORU nodes in operator mode

* One or more users start Smart Rollup nodes.

docs/architecture/smart-rollups.md

@@ -2,7 +2,7 @@
 title: Smart Rollups
 authors: 'Nomadic Labs, TriliTech, Tim McMackin'
 last_update:
-  date: 18 January 2024
+  date: 11 March 2024
 ---
 
 Smart Rollups play a crucial part in providing high scalability on Tezos.
@@ -91,7 +91,8 @@ Eventually include:
 
 The general flow of a Smart Rollup goes through these phases:
 
-1. Origination: A user called the _rollup operator_ originates the Smart Rollup to layer 1 and one or more users start nodes based on that Smart Rollup to independently verify its operation.
+1. Origination: A user originates the Smart Rollup to layer 1.
+1. One or more users start Smart Rollup nodes.
 1. Commitment periods: The Smart Rollup nodes receive the messages in the Smart Rollup inbox, run processing based on those messages, generate but do not run outbox messages, and publish a hash of their state at the end of the period, called a commitment.
 1. Refutation periods: Nodes can publish a concurrent commitment to refute a published commitment.
 1. Triggering outbox messages: When the commitment can no longer be refuted, any client can trigger outbox messages, which create transactions.