DOC: Fix min_count docstring (#19005)

TomAugspurger · web-flow · commit 35443b517df1 · 2017-12-30T13:55:36.000-06:00
[ci skip]
diff --git a/pandas/core/generic.py b/pandas/core/generic.py
@@ -7664,7 +7664,7 @@ def _doc_parms(cls):
 
 
 _min_count_stub = """\
-min_count : int, default 1
+min_count : int, default 0
     The required number of valid values to perform the operation. If fewer than
     ``min_count`` non-NA values are present the result will be NA.
 
