docs: networking: convert phonet.txt to ReST

- add SPDX header;
- adjust title markup;
- use copyright symbol;
- add notes markups;
- 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>
Acked-by: Rémi Denis-Courmont <courmisch@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst
index 8262b535a83e..e460026331c6 100644
--- a/Documentation/networking/index.rst
+++ b/Documentation/networking/index.rst
@@ -90,6 +90,7 @@ Contents:
    openvswitch
    operstates
    packet_mmap
+   phonet
 
 .. only::  subproject and html