[PATCH] Remove link to nonexistent rocket driver docs

[Desmond Cheong Zhi Xi <desmondcheongzx@xxxxxxxxx>]

Fixes: 3b00b6af7a5b ("tty: rocket, remove the driver")
The rocket driver and documentation were removed in this commit, but
the corresponding entry in index.rst was not removed.

Signed-off-by: Desmond Cheong Zhi Xi <desmondcheongzx@xxxxxxxxx>
---
 Documentation/driver-api/serial/index.rst | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Documentation/driver-api/serial/index.rst b/Documentation/driver-api/serial/index.rst
index 21351b8c95a4..8f7d7af3b90b 100644
--- a/Documentation/driver-api/serial/index.rst
+++ b/Documentation/driver-api/serial/index.rst
@@ -19,7 +19,6 @@ Serial drivers
 
     moxa-smartio
     n_gsm
-    rocket
     serial-iso7816
     serial-rs485
 
-- 
2.25.1