ACPI / property: Fix acpi_graph_get_remote_endpoint() name in kerneldoc

The function is called acpi_graph_get_remote_endpoint(), not
acpi_graph_get_remote_enpoint().

Fixes: 79389a83

 ("ACPI / property: Add support for remote endpoints")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>