docs: networking: convert 6lowpan.txt to ReST

- add SPDX header;
- use document 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>
Reviewed-by: Stefan Schmidt <stefan@datenfreihafen.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst
index d07d9855dcd3..683bcbfbed75 100644
--- a/Documentation/networking/index.rst
+++ b/Documentation/networking/index.rst
@@ -33,6 +33,7 @@ Contents:
    tls
    tls-offload
    nfc
+   6lowpan
 
 .. only::  subproject and html