Typo in cifs readme in name of module parm directory

Suresh had a typo in his recent patch adding information on
the new oplock_endabled parm. Should be documented as in
directory /sys/module/cifs/parameters not /proc/module/cifs/parameters

Signed-off-by: Steve French <smfrench@gmail.com>

fs/cifs/README

@@ -751,7 +751,7 @@ These module parameters can be specified or modified either during the time of
 module loading or during the runtime by using the interface
 	/proc/module/cifs/parameters/<param>
 
-i.e. echo "value" > /proc/module/cifs/parameters/<param>
+i.e. echo "value" > /sys/module/cifs/parameters/<param>
 
 1. echo_retries - The number of echo attempts before giving up and
 		  reconnecting to the server. The default is 5. The value 0