[PATCH 2/2] docs: driver-api: bt8xxgpio: Revive dead link

[Jonathan Neuschäfer <j.neuschaefer@xxxxxxx>]

www.bu3sch.de has been unusable for several years, but the same
information is available on bues.ch.

Cc: Michael Buesch <m@xxxxxxx>
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@xxxxxxx>
---
 Documentation/driver-api/gpio/bt8xxgpio.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/driver-api/gpio/bt8xxgpio.rst b/Documentation/driver-api/gpio/bt8xxgpio.rst
index a845feb074de..d7e75f1234e7 100644
--- a/Documentation/driver-api/gpio/bt8xxgpio.rst
+++ b/Documentation/driver-api/gpio/bt8xxgpio.rst
@@ -2,7 +2,7 @@
 A driver for a selfmade cheap BT8xx based PCI GPIO-card (bt8xxgpio)
 ===================================================================

-For advanced documentation, see http://www.bu3sch.de/btgpio.php
+For advanced documentation, see https://bues.ch/cms/unmaintained/btgpio.html

 A generic digital 24-port PCI GPIO card can be built out of an ordinary
 Brooktree bt848, bt849, bt878 or bt879 based analog TV tuner card. The
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2.20.1