Add drop_while as doc alias to Iterator::skip_while

Author: ScriptDevil

core/src/iter/traits/iterator.rs

@@ -1023,6 +1023,7 @@ pub trait Iterator {
     /// assert_eq!(iter.next(), None);
     /// ```
     #[inline]
+    #[doc(alias = "drop_while")]
     #[stable(feature = "rust1", since = "1.0.0")]
     fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P>
     where