Update SafeTransferLib.sol

nit comments

src/libraries/SafeTransferLib.sol

@@ -34,20 +34,20 @@ library SafeTransferLib {
                 freeMemoryPointer,
                 0xa9059cbb00000000000000000000000000000000000000000000000000000000
             )
-            mstore(add(freeMemoryPointer, 4), to) // append the 'to' argument
-            mstore(add(freeMemoryPointer, 36), amount) // append the 'amount' argument
+            mstore(add(freeMemoryPointer, 4), to) // append the "to" argument
+            mstore(add(freeMemoryPointer, 36), amount) // append the "amount" argument
 
             success := and(
                 // set success to whether the call reverted, if not we check it either
-                // returned exactly 1 (not just any non-zero data), or had no return data
+                // returned exactly 1 (can't just be non-zero data), or had no return data
                 or(
                     and(eq(mload(0), 1), gt(returndatasize(), 31)),
                     iszero(returndatasize())
                 ),
                 // we use 68 because the length of our calldata totals up like so: 4 + 32 * 2
                 // we use 0 and 32 to copy up to 32 bytes of return data into the scratch space
-                // counterintuitively, this call must be positioned second to the addition in the
-                // order of operations or else returndatasize() will be zero during the computation
+                // counterintuitively, this call must be positioned second to the or() call in the
+                // surrounding and() call or else returndatasize() will be zero during the computation
                 call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
             )
         }