single-swaps documentation Reentrancy issue

[sterlingcrispin]

I deployed the sample contract here for single swaps on Rinkeby and swapExactInputSingle fails with Fail with error 'LOK' the reentrancy error

https://docs.uniswap.org/protocol/guides/swaps/single-swaps

It would be great if the provided sample swap contract was a functional example that adhered to the Uniswap reentrancy requirements