DOC: remove references to deprecated numpy negation method

Author: Mortada Mehyar <mortada.mehyar@gmail.com> Closes pandas-dev#13310 from mortada/deprecated_negation_in_docs and squashes the following commits: 3b46a1b [Mortada Mehyar] DOC: remove references to deprecated numpy negation method

Author: mortada

pandas/core/common.py

@@ -142,7 +142,7 @@ def _isnull_old(obj):
 
 def _use_inf_as_null(key):
  """Option change callback for null/inf behaviour
- Choose which replacement for numpy.isnan / -numpy.isfinite is used.
+ Choose which replacement for numpy.isnan / ~numpy.isfinite is used.
 
  Parameters
  ----------
@@ -233,7 +233,7 @@ def _isnull_ndarraylike_old(obj):
 
 
 def notnull(obj):
- """Replacement for numpy.isfinite / -numpy.isnan which is suitable for use
+ """Replacement for numpy.isfinite / ~numpy.isnan which is suitable for use
  on object arrays.
 
  Parameters
@@ -1115,7 +1115,7 @@ def _possibly_cast_to_datetime(value, dtype, errors='raise'):
 
 def _possibly_infer_to_datetimelike(value, convert_dates=False):
  """
- we might have a array (or single object) that is datetime like,
+ we might have an array (or single object) that is datetime like,
  and no dtype is passed don't change the value unless we find a
  datetime/timedelta set