fixup! Add HeapSize for Stats

Author: mkleen

datafusion/common/src/heap_size.rs

@@ -29,7 +29,7 @@ use std::collections::HashMap;
 use std::fmt::Debug;
 use std::sync::Arc;
 /// Since HeapSize is private in arrow-rs this code is taken over
-/// from https://github.com/apache/arrow-rs/blob/main/parquet/src/file/metadata/memory.rs
+/// from <https://github.com/apache/arrow-rs/blob/main/parquet/src/file/metadata/memory.rs>
 /// and extended to provide heap size estimation for Statistics. This needs to be cleaned
 /// up and replaced once the HeapSize is publicly available from arrow-rs.
 ///