[PATCH -next] hung_task: fix Documentation warning

[Randy Dunlap]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

Fix Sphinx warning when building Documentation:

Documentation/admin-guide/sysctl/kernel.rst:397: WARNING: Title underline too short.

hung_task_interval_warnings:
===================

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Dmitry Safonov <dima@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
---
 Documentation/admin-guide/sysctl/kernel.rst |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20191008.orig/Documentation/admin-guide/sysctl/kernel.rst
+++ linux-next-20191008/Documentation/admin-guide/sysctl/kernel.rst
@@ -394,7 +394,7 @@ This file shows up if CONFIG_DETECT_HUNG
 
 
 hung_task_interval_warnings:
-===================
+============================
 
 The same as hung_task_warnings, but set the number of interval
 warnings to be issued about detected hung tasks during check