Add comment about snapshot information

Author: rshkv

crates/iceberg/src/metadata_scan.rs

@@ -147,6 +147,8 @@ impl MetadataTable for SnapshotsTable {
 /// Metadata log entries table.
 ///
 /// Use to inspect the current and historical metadata files in the table.
+/// Contains every metadata file and the time it was added. For each metadata
+/// file, the table contains information about the latest snapshot at the time.
 pub struct MetadataLogEntriesTable;
 
 impl MetadataLogEntriesTable {