Update documentation of feedbacks::map::OneOrFilledIsNovel (#1423)

this previously seemed to describe `NextPow2IsNovel`

libafl/src/feedbacks/map.rs

@@ -207,7 +207,7 @@ where
     }
 }
 
-/// A filter that only saves values which are at least the next pow2 class
+/// Only consider `T::one()` or `T::max_value()`, if they are bigger than the old value, as novel
 #[derive(Clone, Debug)]
 pub struct OneOrFilledIsNovel {}
 impl<T> IsNovel<T> for OneOrFilledIsNovel