[PATCH net-next] net/smc: fix document build WARNING from smc-sysctl.rst

[Dust Li <dust.li@linux.alibaba.com>]

Stephen reported the following warning messages from smc-sysctl.rst

Documentation/networking/smc-sysctl.rst:3: WARNING: Title overline
too short.
Documentation/networking/smc-sysctl.rst: WARNING: document isn't
included in any toctree

Fix the title overline and add smc-sysctl entry into
Documentation/networking/index.rst

Fixes: 12bbb0d163a9 ("net/smc: add sysctl for autocorking")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Dust Li <dust.li@linux.alibaba.com>
---
 Documentation/networking/index.rst      | 1 +
 Documentation/networking/smc-sysctl.rst | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst
index 58bc8cd367c6..ce017136ab05 100644
--- a/Documentation/networking/index.rst
+++ b/Documentation/networking/index.rst
@@ -96,6 +96,7 @@ Contents:
    sctp
    secid
    seg6-sysctl
+   smc-sysctl
    statistics
    strparser
    switchdev
diff --git a/Documentation/networking/smc-sysctl.rst b/Documentation/networking/smc-sysctl.rst
index c53f8c61c9e4..0987fd1bc220 100644
--- a/Documentation/networking/smc-sysctl.rst
+++ b/Documentation/networking/smc-sysctl.rst
@@ -1,11 +1,11 @@
 .. SPDX-License-Identifier: GPL-2.0
 
-=========
+==========
 SMC Sysctl
-=========
+==========
 
 /proc/sys/net/smc/* Variables
-==============================
+=============================
 
 autocorking_size - INTEGER
 	Setting SMC auto corking size:
-- 
2.19.1.3.ge56e4f7