simplify import statements in doctest examples

nltk/tag/crf.py

@@ -24,7 +24,7 @@ class CRFTagger(TaggerI):
     """
     A module for POS tagging using CRFSuite https://pypi.python.org/pypi/python-crfsuite
     
-    >>> from nltk.tag.crf import CRFTagger
+    >>> from nltk.tag import CRFTagger
     >>> ct = CRFTagger()
  
     >>> train_data = [[('University','Noun'), ('is','Verb'), ('a','Det'), ('good','Adj'), ('place','Noun')],

nltk/tag/hunpos.py

@@ -33,7 +33,7 @@ class HunposTagger(TaggerI):
 
     Example:
 
-        >>> from nltk.tag.hunpos import HunposTagger
+        >>> from nltk.tag import HunposTagger
         >>> ht = HunposTagger('en_wsj.model')
         >>> ht.tag('What is the airspeed of an unladen swallow ?'.split())
         [('What', 'WP'), ('is', 'VBZ'), ('the', 'DT'), ('airspeed', 'NN'), ('of', 'IN'), ('an', 'DT'), ('unladen', 'NN'), ('swallow', 'VB'), ('?', '.')]