improve docs

iroh-bytes/src/store/traits.rs

@@ -635,11 +635,15 @@ pub enum ExportFormat {
     /// The hash refers to any blob and will be exported to a single file.
     #[default]
     Blob,
-    /// The hash refers to a [`Collection`] blob and all children of the collection will be
-    /// exported to one file per child.
+    /// The hash refers to a [`crate::format::collection::Collection`] blob
+    /// and all children of the collection shall be exported to one file per child.
     ///
-    /// If the blob can be parsed as a [`Collection`], all children of the collection will be
-    /// exported. If the blob cannot be parsed as a [`Collection`], the operation will be failed.
+    /// If the blob can be parsed as a [`BlobFormat::HashSeq`], and the first child contains
+    /// collection metadata, all other children of the collection will be exported to
+    /// a file each, with their collection name treated as a relative path to the export
+    /// destination path.
+    ///
+    /// If the blob cannot be parsed as a collection, the operation will fail.
     Collection,
 }