Fix expected sentiwordnet doctest output

Author: ekaf

nltk/corpus/reader/sentiwordnet.py

@@ -23,7 +23,7 @@
  SentiSynset('slow.v.03'), SentiSynset('slow.a.01'),\
  SentiSynset('slow.a.02'), SentiSynset('dense.s.04'),\
  SentiSynset('slow.a.04'), SentiSynset('boring.s.01'),\
- SentiSynset('dull.s.08'), SentiSynset('slowly.r.01'),\
+ SentiSynset('dull.s.05'), SentiSynset('slowly.r.01'),\
  SentiSynset('behind.r.03')]
     >>> happy = swn.senti_synsets('happy', 'a')
     >>> happy0 = list(happy)[0]