trivial: fix typos "man[ae]g?ment" -> "management"

Signed-off-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index 1b6292b..957b22f 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -133,7 +133,7 @@
 	than requested, the rest of the page will be used,
 	making the actual allocation bigger than requested.
 	( Note, the size may not be a multiple of the page size
-	  due to buffer managment overhead. )
+	  due to buffer management overhead. )
 
 	This can only be updated when the current_tracer
 	is set to "nop".