doucment that Py_SetPath copies its argument (closes #23110)

--HG--
branch : 3.4
merge 3.4 (#23110)
improve incorrect French (#23109)

Following suggestions from Clément.

--HG--
branch : 3.4
extra : source : 55462210ba2dc454d33ed1c37818ddc33dff9b0a
merge 3.4 (#23109)
update correct French examples (#23109)

--HG--
branch : 3.4
extra : amend_source : 705fb3e7ce788dbd6791da99978415022216d8de
merge 3.4