Added revokeSession + add description to getSession (#270)

* Added revokeSession + add description to getSession

* Refactored UnknownError into reusable component

* fix: remove sessionId from descriptions

multichain/openrpc.yaml

@@ -47,7 +47,23 @@ methods:
         result:
           name: wallet_invokeMethodResult
           value: "0x1"
+  - name: wallet_revokeSession
+    description: The `wallet_revokeSession` method revokes the entire active session.
+    params: []
+    result:
+      name: wallet_revokeSessionResult
+      schema:
+        type: boolean
+    examples:
+      - name: wallet_revokeSessionExample
+        params: []
+        result:
+          name: wallet_revokeSessionExampleResult
+          value: true
+    errors:
+      - $ref: "#/components/errors/UnknownError"
   - name: wallet_getSession
+    description: The `wallet_getSession` method returns an active session.
     params: []
     result:
       name: wallet_getSessionResult
@@ -288,8 +304,7 @@ methods:
               sessionProperties:
                 expiry: "2022-11-31T17:07:31+00:00"
     errors:
-      - code: 5000
-        message: Unknown error with request
+      - $ref: "#/components/errors/UnknownError"
       - code: 5100
         message: Requested networks are not supported
       - code: 5101
@@ -303,6 +318,10 @@ methods:
       - code: 5302
         message: Invalid sessionProperties requested
 components:
+  errors:
+    UnknownError:
+      code: 5000
+      message: Unknown error with request
   schemas:
     SessionScopes:
       type: object