docs: networking: convert z8530drv.txt to ReST

- add SPDX header;
- use copyright symbol;
- adjust titles and chapters, adding proper markups;
- mark tables as such;
- 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/index.rst

@@ -121,6 +121,7 @@ Contents:
    xfrm_proc
    xfrm_sync
    xfrm_sysctl
+   z8530drv
 
 .. only::  subproject and html
 

MAINTAINERS

@@ -18644,7 +18644,7 @@ L:	linux-hams@vger.kernel.org
 S:	Maintained
 W:	http://yaina.de/jreuter/
 W:	http://www.qsl.net/dl1bke/
-F:	Documentation/networking/z8530drv.txt
+F:	Documentation/networking/z8530drv.rst
 F:	drivers/net/hamradio/*scc.c
 F:	drivers/net/hamradio/z8530.h
 

drivers/net/hamradio/Kconfig

@@ -84,7 +84,7 @@ config SCC
 	---help---
 	  These cards are used to connect your Linux box to an amateur radio
 	  in order to communicate with other computers. If you want to use
-	  this, read <file:Documentation/networking/z8530drv.txt> and the
+	  this, read <file:Documentation/networking/z8530drv.rst> and the
 	  AX25-HOWTO, available from
 	  <http://www.tldp.org/docs.html#howto>. Also make sure to say Y
 	  to "Amateur Radio AX.25 Level 2" support.
@@ -98,7 +98,7 @@ config SCC_DELAY
 	help
 	  Say Y here if you experience problems with the SCC driver not
 	  working properly; please read
-	  <file:Documentation/networking/z8530drv.txt> for details.
+	  <file:Documentation/networking/z8530drv.rst> for details.
 
 	  If unsure, say N.
 

drivers/net/hamradio/scc.c

@@ -7,7 +7,7 @@
  *            ------------------
  *
  * You can find a subset of the documentation in 
- * Documentation/networking/z8530drv.txt.
+ * Documentation/networking/z8530drv.rst.
  */
 
 /*