docs: networking: convert fore200e.txt to ReST

- add SPDX header;
- adjust title markup;
- mark code blocks and literals as such;
- adjust identation, whitespaces and blank lines;
- 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/fore200e.rst

@@ -1,6 +1,8 @@
+.. SPDX-License-Identifier: GPL-2.0
 
+=============================================
 FORE Systems PCA-200E/SBA-200E ATM NIC driver
----------------------------------------------
+=============================================
 
 This driver adds support for the FORE Systems 200E-series ATM adapters
 to the Linux operating system. It is based on the earlier PCA-200E driver
@@ -27,8 +29,8 @@ in the linux/drivers/atm directory for details and restrictions.
 Firmware Updates
 ----------------
 
-The FORE Systems 200E-series driver is shipped with firmware data being 
-uploaded to the ATM adapters at system boot time or at module loading time. 
+The FORE Systems 200E-series driver is shipped with firmware data being
+uploaded to the ATM adapters at system boot time or at module loading time.
 The supplied firmware images should work with all adapters.
 
 However, if you encounter problems (the firmware doesn't start or the driver

Documentation/networking/index.rst

@@ -57,6 +57,7 @@ Contents:
    eql
    fib_trie
    filter
+   fore200e
 
 .. only::  subproject and html
 

drivers/atm/Kconfig

@@ -336,7 +336,7 @@ config ATM_FORE200E
 	  on PCI and SBUS hosts. Say Y (or M to compile as a module
 	  named fore_200e) here if you have one of these ATM adapters.
 
-	  See the file <file:Documentation/networking/fore200e.txt> for
+	  See the file <file:Documentation/networking/fore200e.rst> for
 	  further details.
 
 config ATM_FORE200E_USE_TASKLET