arm: Documentation: update a path name

the path in the example cmd is out of date, and the path for now
is also mentioned in the same file

Signed-off-by: Perr Zhang <strongbox8@zoho.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/arm/mem_alignment b/Documentation/arm/mem_alignment
index c7c7a11..6335fca 100644
--- a/Documentation/arm/mem_alignment
+++ b/Documentation/arm/mem_alignment
@@ -48,7 +48,7 @@
 For example, the following will turn on the warnings, but without
 fixing up or sending SIGBUS signals:
 
-	echo 1 > /proc/sys/debug/alignment
+	echo 1 > /proc/cpu/alignment
 
 You can also read the content of the same file to get statistical
 information on unaligned access occurrences plus the current mode of