scsi: docs: convert sym53c8xx_2.txt to ReST

Link: https://lore.kernel.org/r/08202c87294d61d147ec4ac784219d20805cdeb5.1583136624.git.mchehab+huawei@kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/Documentation/scsi/index.rst b/Documentation/scsi/index.rst
index 00584fb..238dd0a 100644
--- a/Documentation/scsi/index.rst
+++ b/Documentation/scsi/index.rst
@@ -42,5 +42,6 @@
    smartpqi
    st
    sym53c500_cs
+   sym53c8xx_2
 
    scsi_transport_srp/figures