Remove note about MultiSign amendment (unconditionalized)

Author: mDuo13

docs/references/http-websocket-apis/public-api-methods/transaction-methods/submit_multisigned.md

@@ -9,8 +9,6 @@ labels:
 
 The `submit_multisigned` command applies a [multi-signed](../../../../concepts/accounts/multi-signing.md) transaction and sends it to the network to be included in future ledgers. (You can also submit multi-signed transactions in binary form using the [`submit` command in submit-only mode](submit.md#submit-only-mode).)
 
-This command requires the [MultiSign amendment][] to be enabled.
-
 ## Request Format
 An example of the request format: