Clarified binary operator checking for integer types.
Clarified binary operator checking for integer types.

LianaHus/solidity,LefterisJP/solidity,debris/solidity,ruchevits/solidity,ruchevits/solidity,douglas-larocca/solidity,vaporry/solidity,chriseth/solidity-doc-test,ruchevits/solidity,arkpar/solidity,ethers/solidity,shahankhatch/solidity,ruchevits/solidity,gluk256/solidity,chriseth/solidity