11832: Fix typo in the style documentation r=lnicola a=Therzok

Was going through the documentation itself and found this typo just waiting to be fixed

Co-authored-by: Marius Ungureanu <therzok@gmail.com>
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bors[bot] 2022-03-27 13:46:35 +00:00 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 ## Helper Functions
Avoid creating singe-use helper functions: Avoid creating single-use helper functions:
```rust ```rust
// GOOD // GOOD