docs: clearing-warn-once.txt: add a title for this document

This document misses a title. Add it, in order to follow the documentation standard. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
mariux64 · Apr 11, 2019 · 26187d1 · 26187d1
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commit 26187d1
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diff --git a/Documentation/clearing-warn-once.txt b/Documentation/clearing-warn-once.txt
@@ -1,3 +1,5 @@
+Clearing WARN_ONCE
+------------------
 
 WARN_ONCE / WARN_ON_ONCE only print a warning once.