Typo in complexity.qmd

exercises/complexity.qmd

@@ -18,7 +18,7 @@ git bisect start
 
 Then a good and a bad commit have to be defined. In our case the bad commit is the most recent one,
 while the good commit is the fourth commit of the repository.
-Find out the has of the respective commits and replace them in the commands below
+Find out the hash of the respective commits and replace them in the commands below
 
 ```bash
 git bisect good <commit>