DOC: Add Notes about difference to numpy behaviour for ddof in std() GH35985 (#35986)

* DOC: Add Notes about difference to numpy behaviour for ddof.

GH35985.

* remove trailing whitespace.

* Update pandas/core/generic.py

wording change.

Co-authored-by: Daniel Saxton <[email protected]>

* Make wording simpler and remove reference to normalization.

* Make wording simpler and remove reference to normalization.

Co-authored-by: Daniel Saxton <[email protected]>

Author: timhunderwood

pandas/core/generic.py

@@ -10832,7 +10832,12 @@ def _doc_parms(cls):
 
 Returns
 -------
-%(name1)s or %(name2)s (if level specified)\n"""
+%(name1)s or %(name2)s (if level specified)
+
+Notes
+-----
+To have the same behaviour as `numpy.std`, use `ddof=0` (instead of the
+default `ddof=1`)\n"""
 
 _bool_doc = """
 %(desc)s