'Config' part of guide website has a different example from what is on github

[renecouto]

The example config on github, which compiles:

https://github.com/profunktor/fs2-rabbit/blob/master/site/docs/config.md

The example config on the website, which does not compile:

https://fs2-rabbit.profunktor.dev/config.html

I know it's a very minor issue, but I thought about trying to contribute for once

[stale]

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