fix doctest warnings in src/sage/coding/ag_code_decoders.pyx

Author: dcoudert

src/sage/coding/ag_code_decoders.pyx

@@ -29,17 +29,18 @@ EXAMPLES::
 The ``decoder`` is now ready for correcting vectors received from a noisy
 channel::
 
-    sage: channel = channels.StaticErrorRateChannel(code.ambient_space(), tau)  # long time
-    sage: message_space = decoder.message_space()                   # long time
-    sage: message = message_space.random_element()                  # long time
-    sage: encoder = decoder.connected_encoder()                     # long time
-    sage: sent_codeword = encoder.encode(message)                   # long time
-    sage: received_vector = channel(sent_codeword)                  # long time
-    sage: (received_vector - sent_codeword).hamming_weight()        # long time
+    sage: # long time
+    sage: channel = channels.StaticErrorRateChannel(code.ambient_space(), tau)
+    sage: message_space = decoder.message_space()
+    sage: message = message_space.random_element()
+    sage: encoder = decoder.connected_encoder()
+    sage: sent_codeword = encoder.encode(message)
+    sage: received_vector = channel(sent_codeword)
+    sage: (received_vector - sent_codeword).hamming_weight()
     4
-    sage: decoder.decode_to_code(received_vector) == sent_codeword  # long time
+    sage: decoder.decode_to_code(received_vector) == sent_codeword
     True
-    sage: decoder.decode_to_message(received_vector) == message     # long time
+    sage: decoder.decode_to_message(received_vector) == message
     True
 
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