fix minor typo in Documentation/as-iosched.txt

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/sys/block/*/iosched/ seems to be /sys/block/*/queue/iosched/ in recent 2.6 kernels.

signed-off by: [email protected]
(do we need this too for Documentation/ "patches"?)

Thanks,
Christian.
- --
BOFH excuse #400:

We are Microsoft. What you are experiencing is not a problem; it is an undocumented feature.
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@@ -132,7 +132,7 @@
 Tuning the anticipatory IO scheduler
 ------------------------------------
 When using 'as', the anticipatory IO scheduler there are 5 parameters under
-/sys/block/*/iosched/. All are units of milliseconds.
+/sys/block/*/queue/iosched/. All are units of milliseconds.
 
 The parameters are:
 * read_expire