[PATCH] docs: fix 'make htmldocs' warning in SCTP.rst

[Wan Jiabing]

Fix following 'make htmldocs' warnings:
./Documentation/security/SCTP.rst:123: WARNING: Title underline too short.
security_sctp_assoc_established()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./Documentation/security/SCTP.rst:123: WARNING: Title underline too short.
security_sctp_assoc_established()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./Documentation/security/SCTP.rst:273: WARNING: Title underline too short.
security_sctp_assoc_established()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./Documentation/security/SCTP.rst:273: WARNING: Title underline too short.
security_sctp_assoc_established()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fixes: 5e50f5d4ff31 ("security: add sctp_assoc_established hook")
Signed-off-by: Wan Jiabing <wanjiabing@xxxxxxxx>
---
 Documentation/security/SCTP.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/security/SCTP.rst b/Documentation/security/SCTP.rst
index 406cc68b8808..b73eb764a001 100644
--- a/Documentation/security/SCTP.rst
+++ b/Documentation/security/SCTP.rst
@@ -120,7 +120,7 @@ calls **sctp_peeloff**\(3).
 
 
 security_sctp_assoc_established()
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Called when a COOKIE ACK is received, and the peer secid will be
 saved into ``@asoc->peer_secid`` for client::
 
@@ -270,7 +270,7 @@ sockets sid and peer sid to that contained in the ``@asoc sid`` and
 
 
 security_sctp_assoc_established()
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Called when a COOKIE ACK is received where it sets the connection's peer sid
 to that in ``@skb``::
 
-- 
2.35.1