fixed documentation to handle the fix where repr and str were swapped

nltk/probability.py

@@ -1663,6 +1663,7 @@ class ConditionalFreqDist(defaultdict):
     the indexing operator:
 
         >>> cfdist[3]
+        FreqDist({'the': 3, 'dog': 2, 'not': 1})
         <FreqDist with 3 samples and 6 outcomes>
         >>> cfdist[3].freq('the')
         0.5