Fix code in routing docs

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Package Version Report

No packages have been updated.

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (638d1e7) 64.23% compared to head (a5870d6) 64.23%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #84 +/- ## ======================================= Coverage 64.23% 64.23% ======================================= Files 80 80 Lines 3285 3285 ======================================= Hits 2110 2110 Misses 1175 1175 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kilian+Schulte). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kilian+Schulte)

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