Fix typo in the FastText example

Author: tomtung

example/tutorial_imdb_fasttext.py

@@ -40,7 +40,7 @@
 # in addition to unigrams.
 N_GRAM = 2
 
-# Size of vocabulary; less frequent works will be treated as "unknown"
+# Size of vocabulary; less frequent words will be treated as "unknown"
 VOCAB_SIZE = 100000
 
 # Number of buckets used for hashing n-grams