doc: correcting the debug path for cachefiles

The original debug path is under "/sys/modules", that's
wrong. The real path in kernel is "/sys/module". So we
can correct it.

Signed-off-by: Hongbo Li <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Christian Brauner <[e-mail]>

Documentation/filesystems/caching/cachefiles.rst

···
 
 	This mask can also be set through sysfs, eg::
 
-		echo 5 >/sys/modules/cachefiles/parameters/debug
+		echo 5 > /sys/module/cachefiles/parameters/debug
 
 
 Starting the Cache