fix some comments

Signed-off-by: Cyrill Leutwiler <[email protected]>

substrate/frame/revive/fixtures/contracts/call_data_load.rs

@@ -15,7 +15,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//! This calls another contract as passed as its account id.
+//! This uses the call data load API to first the first input byte.
+//! This single input byte is used as the offset for a second call
+//! to the call data load API.
+//! The output of the second API call is returned.
+
 #![no_std]
 #![no_main]
 

substrate/frame/revive/src/tests.rs

@@ -4417,15 +4417,15 @@ fn call_data_load_api_works() {
 		let Contract { addr, .. } =
 			builder::bare_instantiate(Code::Upload(code)).build_and_unwrap_contract();
 
-		// Call the contract: It reads a whole U256 for the offset
-		// and then return what call data load returns with this offset.
+		// Call the contract: It reads a byte for the offset and then returns
+		// what call data load returned using this byte as the offset.
 		let input = (2u8, U256::from(255).to_big_endian()).encode();
 		let received = builder::bare_call(addr).data(input).build().result.unwrap();
 		assert_eq!(received.flags, ReturnFlags::empty());
 		assert_eq!(U256::from_little_endian(&received.data), U256::from(65280));
 
 		// OOB case
-		let input = (2u8).encode();
+		let input = (42u8).encode();
 		let received = builder::bare_call(addr).data(input).build().result.unwrap();
 		assert_eq!(received.flags, ReturnFlags::empty());
 		assert_eq!(U256::from_little_endian(&received.data), U256::zero());