Merge #11832

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 <[email protected]>

Author: bors[bot]

docs/dev/style.md

@@ -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