aoe: update documentation with new URL and VM settings reference

The old area has a new URL.  Also, now that the driver can perform better,
it is worth mentioning the VM settings that help aoe to sink dirty pages
out early, avoiding unecessary memory pressure when much I/O is going on.
Signed-off-by: NEd Cashin <ecashin@coraid.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Documentation/aoe/aoe.txt

-The EtherDrive (R) HOWTO for users of 2.6 kernels is found at ...
+The EtherDrive (R) HOWTO for 2.6 and 3.x kernels is found at ...
 
-  http://www.coraid.com/SUPPORT/EtherDrive-HBA  
+  http://support.coraid.com/support/linux/EtherDrive-2.6-HOWTO.html
 
-  It has many tips and hints!
+It has many tips and hints!  Please see, especially, recommended
+tunings for virtual memory:
+
+  http://support.coraid.com/support/linux/EtherDrive-2.6-HOWTO-5.html#ss5.19
 
 The aoetools are userland programs that are designed to work with this
 driver.  The aoetools are on sourceforge.

MAINTAINERS

@@ -1246,7 +1246,7 @@ F:	include/linux/i2c/at24.h
 
 ATA OVER ETHERNET (AOE) DRIVER
 M:	"Ed L. Cashin" <ecashin@coraid.com>
-W:	http://www.coraid.com/support/linux
+W:	http://support.coraid.com/support/linux
 S:	Supported
 F:	Documentation/aoe/
 F:	drivers/block/aoe/