Spelling and grammar

Author: EtK2000

examples/completion.py

@@ -59,7 +59,7 @@ class Person(Document):
  def clean(self):
  """
  Automatically construct the suggestion input and weight by taking all
- possible permutation of Person's name as ``input`` and taking their
+ possible permutations of Person's name as ``input`` and taking their
  popularity as ``weight``.
  """
  self.suggest = {