Documentation: move mandatory locking documentation to filesystems/

Shouldn't this mandatory-locking documentation be in the
Documentation/filesystems directory?

Give it a more descriptive name while we're at it, and update 00-INDEX
with a more inclusive description of Documentation/filesystems (which
has already talked about more than just individual filesystems).

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX
index 43e89b1..910473c 100644
--- a/Documentation/00-INDEX
+++ b/Documentation/00-INDEX
@@ -145,7 +145,7 @@
 feature-removal-schedule.txt
 	- list of files and features that are going to be removed.
 filesystems/
-	- directory with info on the various filesystems that Linux supports.
+	- info on the vfs and the various filesystems that Linux supports.
 firmware_class/
 	- request_firmware() hotplug interface info.
 floppy.txt
@@ -240,8 +240,6 @@
 	- directory with info about Linux on Motorola 68k architecture.
 magic-number.txt
 	- list of magic numbers used to mark/protect kernel data structures.
-mandatory.txt
-	- info on the Linux implementation of Sys V mandatory file locking.
 mca.txt
 	- info on supporting Micro Channel Architecture (e.g. PS/2) systems.
 md.txt