docs: networking: device drivers: convert smsc/smc9.txt to ReST

- add SPDX header;
- mark code blocks and literals as such;
- adjust identation, whitespaces and blank lines where needed;
- add to networking/index.rst.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/device_drivers/index.rst

@@ -46,6 +46,7 @@ Contents:
    neterion/vxge
    qualcomm/rmnet
    sb1000
+   smsc/smc9
 
 .. only::  subproject and html
 

Documentation/networking/device_drivers/smsc/smc9.txt → Documentation/networking/device_drivers/smsc/smc9.rst

+.. SPDX-License-Identifier: GPL-2.0
 
+================
 SMC 9xxxx Driver
+================
+
 Revision 0.12
+
 3/5/96
+
 Copyright 1996  Erik Stahlman
+
 Released under terms of the GNU General Public License.
 
 This file contains the instructions and caveats for my SMC9xxx driver.  You
@@ -17,10 +24,10 @@ Things to note about installation:
      options, such as for forcing IRQ.
 
 
-  3.  To compile as a module, run 'make' .   
+  3.  To compile as a module, run 'make'.
       Make will give you the appropriate options for various kernel support.
 
-  4.  Loading the driver as a module :
+  4.  Loading the driver as a module::
 
 	use:   insmod smc9194.o
 	optional parameters:
@@ -39,4 +46,3 @@ FTP:
 
 Contacting me:
     erik@mail.vt.edu
- 

drivers/net/ethernet/smsc/Kconfig

@@ -28,7 +28,7 @@ config SMC9194
 	  option if you have a DELL laptop with the docking station, or
 	  another SMC9192/9194 based chipset.  Say Y if you want it compiled
 	  into the kernel, and read the file
-	  <file:Documentation/networking/device_drivers/smsc/smc9.txt>.
+	  <file:Documentation/networking/device_drivers/smsc/smc9.rst>.
 
 	  To compile this driver as a module, choose M here. The module
 	  will be called smc9194.
@@ -44,7 +44,7 @@ config SMC91X
 	  This is a driver for SMC's 91x series of Ethernet chipsets,
 	  including the SMC91C94 and the SMC91C111. Say Y if you want it
 	  compiled into the kernel, and read the file
-	  <file:Documentation/networking/device_drivers/smsc/smc9.txt>.
+	  <file:Documentation/networking/device_drivers/smsc/smc9.rst>.
 
 	  This driver is also available as a module ( = code which can be
 	  inserted in and removed from the running kernel whenever you want).