scsi: docs: g_NCR5380: Shorten chapter heading

Make the chapter heading be 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/20230518212749.18266-9-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: Finn Thain <fthain@linux-m68k.org>
Cc: Michael Schmitz <schmitzmic@gmail.com>
Acked-by: Finn Thain <fthain@linux-m68k.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Documentation/scsi/g_NCR5380.rst

 .. SPDX-License-Identifier: GPL-2.0
 .. include:: <isonum.txt>
 
-==========================================
-README file for the Linux g_NCR5380 driver
-==========================================
+================
+g_NCR5380 driver
+================
 
 Copyright |copy| 1993 Drew Eckhard