docs: networking: convert eql.txt to ReST

- add SPDX header;
- add a document title;
- adjust titles and chapters, adding proper markups;
- mark code blocks and literals as such;
- mark tables 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/index.rst

@@ -54,6 +54,7 @@ Contents:
    defza
    dns_resolver
    driver
+   eql
 
 .. only::  subproject and html
 

drivers/net/Kconfig

@@ -126,7 +126,7 @@ config EQUALIZER
 	  Linux driver or with a Livingston Portmaster 2e.
 
 	  Say Y if you want this and read
-	  <file:Documentation/networking/eql.txt>.  You may also want to read
+	  <file:Documentation/networking/eql.rst>.  You may also want to read
 	  section 6.2 of the NET-3-HOWTO, available from
 	  <http://www.tldp.org/docs.html#howto>.