[PATCH] docs: driver-api: Remove reference to sgi-ioc4

[Harald Seiler <hws@xxxxxxx>]

Commit f7bc6e42bf12 ("drivers: remove the SGI SN2 IOC4 base support")
removed support for SGI SN2 IOC4 and the relevant documentation files.
Remove a leftover reference in the toctree of the driver-api
documentation to fix this sphinx error:

    Documentation/driver-api/index.rst:14: WARNING: toctree contains
        reference to nonexisting document 'driver-api/sgi-ioc4'

Signed-off-by: Harald Seiler <hws@xxxxxxx>
---
 Documentation/driver-api/index.rst | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst
index c1e1b3f6d419..46d6a165b5a5 100644
--- a/Documentation/driver-api/index.rst
+++ b/Documentation/driver-api/index.rst
@@ -92,7 +92,6 @@ available subsections can be seen below.
    pwm
    rfkill
    serial/index
-   sgi-ioc4
    sm501
    smsc_ece1099
    switchtec
-- 
2.23.0