Fix typo in docstring

longuest -> longest

Author: jfsantos

keras/preprocessing/sequence.py

@@ -7,7 +7,7 @@
 def pad_sequences(sequences, maxlen=None, dtype='int32', padding='pre', truncating='pre', value=0.):
     """
         Pad each sequence to the same length: 
-        the length of the longuest sequence.
+        the length of the longest sequence.
 
         If maxlen is provided, any sequence longer
         than maxlen is truncated to maxlen. Truncation happens off either the beginning (default) or