Fix minor typo

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: pombredanne

pandas/core/generic.py

@@ -1815,7 +1815,7 @@ def __hash__(self):
  ' hashed'.format(self.__class__.__name__))
 
  def __iter__(self):
- """Iterate over infor axis"""
+ """Iterate over info axis"""
  return iter(self._info_axis)
 
  # can we get a better explanation of this?