sched: remove sched-design.txt from 00-INDEX

Impact: remove stale documentation reference

sched-design.txt has been removed.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

authored by Li Zefan and committed by Ingo Molnar a0e5ebdc a9cf4ddb

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Documentation/scheduler/00-INDEX
··· 4 - CPU Scheduler implementation hints for architecture specific code. 5 sched-coding.txt 6 - reference for various scheduler-related methods in the O(1) scheduler. 7 - sched-design.txt 8 - - goals, design and implementation of the Linux O(1) scheduler. 9 sched-design-CFS.txt 10 - goals, design and implementation of the Complete Fair Scheduler. 11 sched-domains.txt
··· 4 - CPU Scheduler implementation hints for architecture specific code. 5 sched-coding.txt 6 - reference for various scheduler-related methods in the O(1) scheduler. 7 sched-design-CFS.txt 8 - goals, design and implementation of the Complete Fair Scheduler. 9 sched-domains.txt