Link to Option/Result for Iterator::sum/product

Author: clubby789

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

@@ -3366,6 +3366,9 @@ pub trait Iterator {
     ///
     /// An empty iterator returns the zero value of the type.
     ///
+    /// `sum()` can be used to sum any type implementing [`Sum`][`core::iter::Sum`],
+    /// including [`Option`][`Option::sum`] and [`Result`][`Result::sum`].
+    ///
     /// # Panics
     ///
     /// When calling `sum()` and a primitive integer type is being returned, this
@@ -3395,6 +3398,9 @@ pub trait Iterator {
     ///
     /// An empty iterator returns the one value of the type.
     ///
+    /// `product()` can be used to multiply any type implementing [`Product`][`core::iter::Product`],
+    /// including [`Option`][`Option::product`] and [`Result`][`Result::product`].
+    ///
     /// # Panics
     ///
     /// When calling `product()` and a primitive integer type is being returned,