DOC fix in docstring of LeavePOut (scikit-learn#14517)

Author: wolframalpha

sklearn/model_selection/_split.py

@@ -207,7 +207,7 @@ class LeavePOut(BaseCrossValidator):
     Parameters
     ----------
     p : int
-        Size of the test sets. Must be strictly greater than the number of
+        Size of the test sets. Must be strictly less than the number of
         samples.
 
     Examples