Fix typo in the style documentation

Was going through the documentation itself and found this typo just waiting to be fixed
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Marius Ungureanu 2022-03-27 15:23:33 +03:00 committed by GitHub
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@ -1036,7 +1036,7 @@ Having the result type specified up-front helps with understanding what the chai
## Helper Functions
Avoid creating singe-use helper functions:
Avoid creating single-use helper functions:
```rust
// GOOD