autofs: use autofs instead of autofs4 in documentation

Finally remove autofs4 references in the filesystems documentation.

Link: http://lkml.kernel.org/r/152626709055.28589.416082809460051475.stgit@pluto.themaw.net
Signed-off-by: Ian Kent <raven@themaw.net>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/filesystems/00-INDEX b/Documentation/filesystems/00-INDEX
index b7bd6c9..a8bd4af 100644
--- a/Documentation/filesystems/00-INDEX
+++ b/Documentation/filesystems/00-INDEX
@@ -10,8 +10,8 @@
 	- info and examples for the distributed AFS (Andrew File System) fs.
 affs.txt
 	- info and mount options for the Amiga Fast File System.
-autofs4-mount-control.txt
-	- info on device control operations for autofs4 module.
+autofs-mount-control.txt
+	- info on device control operations for autofs module.
 automount-support.txt
 	- information about filesystem automount support.
 befs.txt