Update src/s1reader/s1_annotation.py

Co-authored-by: Scott Staniewicz <[email protected]>

Author: seongsujeong

src/s1reader/s1_annotation.py

@@ -979,7 +979,7 @@ def extract_polynomial_sequence(cls, polynomial_list: list,
 
         Returns:
         --------
-        _: tuple()
+        tuple
             Tuple of (vec_aztime_sequence,
                       arr_coeff_sequence,
                       vec_tau0_sequence)