add mention of policy params (#420)

* add mention of policy params

* close quotation

* mention encoding

Author: MasterHW

concepts/policies/examples/ethereum.mdx

@@ -50,6 +50,16 @@ See [here](../../../concepts/policies/smart-contract-interfaces) for more inform
 }
 ```
 
+### Deny signing of `NO_OP` keccak256 payloads
+
+```json
+{
+  "policyName": "Deny NO_OP hash signing",
+  "effect": "EFFECT_DENY",
+  "condition": "activity.type == 'ACTIVITY_TYPE_SIGN_RAW_PAYLOAD_V2' && activity.params.hash_function == 'HASH_FUNCTION_NO_OP' && activity.params.encoding != 'PAYLOAD_ENCODING_EIP712'"
+}
+```
+
 #### Allow signing of EIP-712 payloads for EIP-3009 Transfers
 
 ```json

concepts/policies/language.mdx

@@ -80,6 +80,7 @@ The language is strongly typed which makes policies easy to author and maintain.
 | **Activity**             | type                     | string                                    | The type of the activity (e.g. ACTIVITY_TYPE_SIGN_TRANSACTION_V2)                                                                                                                                                                                                                      |
 |                          | resource                 | string                                    | The resource type the activity targets: `USER`, `PRIVATE_KEY`, `POLICY`, `WALLET`, `ORGANIZATION`, `INVITATION`, `CREDENTIAL`, `CONFIG`, `RECOVERY`, `AUTH`, `OTP`, `PAYMENT_METHOD`, `SUBSCRIPTION`                                                                                   |
 |                          | action                   | string                                    | The action of the activity: `CREATE`, `UPDATE`, `DELETE`, `SIGN`, `EXPORT`, `IMPORT`                                                                                                                                                                                                   |
+|                          | params                   | string                                    | The parameters of the activity: `SIGN_RAW_PAYLOADS`, `SIGN_RAW_PAYLOAD_V2` - `hash_function`, `encoding`                                                                                                                                                                               |
 | **Wallet**               | id                       | string                                    | The identifier of the wallet                                                                                                                                                                                                                                                           |
 |                          | imported                 | bool                                      | Boolean indicating whether or not this wallet has been imported                                                                                                                                                                                                                        |
 |                          | exported                 | bool                                      | Boolean indicating whether or not this wallet has been exported                                                                                                                                                                                                                        |