docs/FAQ: fix typo [skip ci]
@@ -263,7 +263,7 @@ changed the value and from which value to which other value. Since
people don't remember their own actions that far back, toggling
between states based on long history would be confusing.
-Because of this we do the simple an understandable thing: default
+Because of this we do the simple and understandable thing: default
values are only defaults and will never affect the value of an option
once set.
