Show that trailing whitespace belongs to comments.

org_mode_samples/comment/indented.org

@@ -1,5 +1,8 @@
 # Comment
   # indented line
 #        At the top of the file
+
+
+
 foo
 # Another comment

src/parser/comment.rs

@@ -8,3 +8,8 @@ pub fn comment<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str,
     start_of_line(context, input)?;
     todo!()
 }
+
+fn comment_line<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
+    start_of_line(context, input)?;
+    todo!()
+}