Update eosio.system-onerror-rc.md

removed deprecated arbitration clauses

contracts/eosio.system/eosio.system-onerror-rc.md

 # Action - `{{ onerror }}`
 
-This Contract is legally binding and can be used in the event of a dispute.
-
 ### Description
 
 The `{{ onerror }}` action... 
@@ -15,5 +13,3 @@ The `{{ onerror }}` action requires the following `inputs` and `input types`:
 | `{{ onerror }}` | `{{ sender_idVar }}`<br/>`{{ sent_trxVar }}` | `{{ uint128 }}`<br/>`{{ bytes }}` |
 
 As an authorized party I {{ signer }} wish to UNKNOWN
-
-All disputes arising from this contract shall be resolved in the EOS Core Arbitration Forum.