Intra doc links for iterator adapters

Author: poliorcetics

core/src/iter/adapters/flatten.rs

@@ -120,8 +120,7 @@ where
 /// This `struct` is created by the [`flatten`] method on [`Iterator`]. See its
 /// documentation for more.
 ///
-/// [`flatten`]: Iterator::flatten
-/// [`Iterator`]: trait.Iterator.html
+/// [`flatten`]: Iterator::flatten()
 #[must_use = "iterators are lazy and do nothing unless consumed"]
 #[stable(feature = "iterator_flatten", since = "1.29.0")]
 pub struct Flatten<I: Iterator<Item: IntoIterator>> {

core/src/iter/adapters/mod.rs

@@ -110,7 +110,7 @@ pub unsafe trait SourceIter {
     /// * whatever remains in the source after iteration has stopped
     /// * the memory that has become unused by advancing a consuming iterator
     ///
-    /// [`next()`]: Iterator::next
+    /// [`next()`]: Iterator::next()
     unsafe fn as_inner(&mut self) -> &mut Self::Source;
 }