docs: networking: convert ipv6.txt to ReST

Not much to be done here:

- add SPDX header;
- add a document title;
- mark a literal as such, in order to avoid a warning;
- add to networking/index.rst.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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 7d133d8dbe2a..709675464e51 100644
--- a/Documentation/networking/index.rst
+++ b/Documentation/networking/index.rst
@@ -70,6 +70,7 @@ Contents:
    iphase
    ipsec
    ip-sysctl
+   ipv6
 
 .. only::  subproject and html