Rollup merge of #92509 - Gentoli:partition-ex, r=camelid

doc: `Iterator::partition` use partial type hints

Switch to partial type hints to indicate only the collection type is needed.

Author: fee1-dead

library/core/src/iter/traits/iterator.rs

@@ -1877,9 +1877,9 @@ pub trait Iterator {
     /// ```
     /// let a = [1, 2, 3];
     ///
-    /// let (even, odd): (Vec<i32>, Vec<i32>) = a
-    ///     .iter()
-    ///     .partition(|&n| n % 2 == 0);
+    /// let (even, odd): (Vec<_>, Vec<_>) = a
+    ///     .into_iter()
+    ///     .partition(|n| n % 2 == 0);
     ///
     /// assert_eq!(even, vec![2]);
     /// assert_eq!(odd, vec![1, 3]);