Removed unwanted doc(hidden)
@@ -4,7 +4,6 @@ use std::collections::HashMap;
use std::hash::Hash;
use std::iter::Iterator;
-#[doc(hidden)]
/// A wrapper to allow for an easy [`into_grouping_map_by`](../trait.Itertools.html#method.into_grouping_map_by)
pub struct MapForGrouping<I, F>(I, F);
