docs: fix cargo doc warnings

lib/src/time_util.rs

@@ -89,7 +89,7 @@ impl DatePattern {
     /// * `kind` must be either "after" or "before". This determines whether the
     ///   pattern will match dates after or before the parsed date.
     ///
-    /// * `now` is the user's current time. This is a DateTime<Tz> because
+    /// * `now` is the user's current time. This is a [`DateTime<Tz>`] because
     ///   knowledge of offset changes is needed to correctly process relative
     ///   times like "today". For example, California entered DST on March 10,
     ///   2024, shifting clocks from UTC-8 to UTC-7 at 2:00 AM. If the pattern

lib/src/union_find.rs

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//! This module implements a UnionFind<T> type which can be used to
+//! This module implements a [`UnionFind<T>`] type which can be used to
 //! efficiently calculate disjoint sets for any data type.
 
 use std::collections::HashMap;
@@ -25,7 +25,7 @@ struct Node<T> {
 }
 
 /// Implementation of the union-find algorithm:
-/// https://en.wikipedia.org/wiki/Disjoint-set_data_structure
+/// <https://en.wikipedia.org/wiki/Disjoint-set_data_structure>
 ///
 /// Joins disjoint sets by size to amortize cost.
 #[derive(Clone)]