message: fix(ctb): minor edit to XDM comment
  Minor edit to a comment that had a typo in the CrossDomainMessenger.
diff: @@ -383,8 +383,8 @@ abstract contract CrossDomainMessenger is
  */
  function baseGas(bytes calldata _message, uint32 _minGasLimit) public pure returns (uint64) {
  // We peform the following math on uint64s to avoid overflow errors. Multiplying the
  - // by MIN_GAS_DYNAMIC_OVERHEAD_NUMERATOR would otherwise limit the _mingasLimit to
  - // approximately 4.2 MM.
  + // by MIN_GAS_DYNAMIC_OVERHEAD_NUMERATOR would otherwise limit the _minGasLimit to
  + // type(uint32).max / MIN_GAS_DYNAMIC_OVERHEAD_NUMERATOR ~= 4.2m.
  return
  // Dynamic overhead
  ((uint64(_minGasLimit) * MIN_GAS_DYNAMIC_OVERHEAD_NUMERATOR) /
  