remove return_revert comment (privacy-scaling-explorations#1587)

### Description

I removed the TODO comment on return_revert.
As @ChihChengLiang mentioned in the issue, that has already been solved
on
privacy-scaling-explorations#908
.

### Issue Link


privacy-scaling-explorations#1194

### Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update

### Contents

- remove the comment

Author: grandchildrice

bus-mapping/src/evm/opcodes/return_revert.rs

@@ -11,7 +11,6 @@ use eth_types::{evm_types::INVALID_INIT_CODE_FIRST_BYTE, Bytecode, GethExecStep,
 #[derive(Debug, Copy, Clone)]
 pub(crate) struct ReturnRevert;
 
-// TODO: rename to indicate this handles REVERT (and maybe STOP)?
 impl Opcode for ReturnRevert {
     fn gen_associated_ops(
         state: &mut CircuitInputStateRef,