scsi: docs: sym53c8xx_2: Shorten chapter heading

Make the chapter heading concise yet still descriptive.
This makes the subsystem table of contents more readable (IMO).
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20230518212749.18266-12-rdunlap@infradead.org
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Documentation/scsi/sym53c8xx_2.rst

 .. SPDX-License-Identifier: GPL-2.0
 
-=========================================
-The Linux SYM-2 driver documentation file
-=========================================
+============
+SYM-2 driver
+============
 
 Written by Gerard Roudier <groudier@free.fr>