sched/core: Fix kernel-doc warnings after code movement

Fix the following kernel-doc warnings after code restructuring:

  ../kernel/sched/core.c:5113: warning: No description found for parameter 't'
  ../kernel/sched/core.c:5113: warning: Excess function parameter 'interval' description in 'sched_rr_get_interval'

	get rid of set_fs()")

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: abca5fc5 ("sched_rr_get_interval(): move compat to native,
Link: http://lkml.kernel.org/r/995c6ded-b32e-bbe4-d9f5-4d42d121aff1@infradead.org


Signed-off-by: Ingo Molnar <mingo@kernel.org>