add missing doctest for C(word)

Author: ClementPernet

src/sage/coding/linear_code.py

@@ -1672,6 +1672,8 @@ def encode(self, word, encoder_name=None, **kwargs):
             sage: word = vector((0, 1, 1, 0))
             sage: C.encode(word)
             (1, 1, 0, 0, 1, 1, 0)
+            sage: C(word)
+            (1, 1, 0, 0, 1, 1, 0)
 
         It is possible to manually choose the encoder amongst the list of the available ones::