[PATCH] Documentation: i2c: add testunit docs to index

[Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>]

Fixes: a8335c64c5f0 ("i2c: add slave testunit driver")
Reported-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
 Documentation/i2c/index.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/i2c/index.rst b/Documentation/i2c/index.rst
index 8a2ad3845191..8b76217e370a 100644
--- a/Documentation/i2c/index.rst
+++ b/Documentation/i2c/index.rst
@@ -47,6 +47,7 @@ Slave I2C
 
    slave-interface
    slave-eeprom-backend
+   slave-testunit-backend
 
 Advanced topics
 ===============
-- 
2.28.0