Improve pytest.exit docs (#11698)

Fixes #11695

AUTHORS

@@ -48,6 +48,7 @@ Ariel Pillemer
 Armin Rigo
 Aron Coyle
 Aron Curzon
+Arthur Richard
 Ashish Kurmi
 Aviral Verma
 Aviv Palivoda

doc/en/reference/reference.rst

@@ -79,7 +79,7 @@ pytest.xfail
 pytest.exit
 ~~~~~~~~~~~
 
-.. autofunction:: pytest.exit(reason, [returncode=False, msg=None])
+.. autofunction:: pytest.exit(reason, [returncode=None, msg=None])
 
 pytest.main
 ~~~~~~~~~~~

src/_pytest/outcomes.py

@@ -112,7 +112,7 @@ def exit(
         only because `msg` is deprecated.
 
     :param returncode:
-        Return code to be used when exiting pytest.
+        Return code to be used when exiting pytest. None means the same as ``0`` (no error), same as :func:`sys.exit`.
 
     :param msg:
         Same as ``reason``, but deprecated. Will be removed in a future version, use ``reason`` instead.