Update BaseRegistrarImplementation.sol

contracts/ethregistrar/BaseRegistrarImplementation.sol

@@ -101,7 +101,7 @@ contract BaseRegistrarImplementation is ERC721, IBaseRegistrar, Ownable {
         return expiries[id];
     }
 
-    // Returns true iff the specified name is available for registration.
+    // Returns true if the specified name is available for registration.
     function available(uint256 id) public view override returns (bool) {
         // Not available if it's registered here or in its grace period.
         return expiries[id] + GRACE_PERIOD < block.timestamp;