Update bothify() description (#97)

Author: karpilin

docs/formatters/numbers-and-strings.md

@@ -208,7 +208,7 @@ echo $faker->lexify('id-????');
 ## `bothify`
 
 Generate a string where `?` characters are replaced with a random letter, and `#` characters are replaces with a random
-digit between 0 and 10. By default, `## ??` is used as input.
+digit between 0 and 9. By default, `## ??` is used as input.
 
 ```php
 echo $faker->bothify();