sched: fix cid_lock kernel-doc warnings

Fix kernel-doc warnings for cid_lock and use_cid_lock.
These comments are not in kernel-doc format.

kernel/sched/core.c:11496: warning: Cannot understand  * @cid_lock: Guarantee forward-progress of cid allocation.
 on line 11496 - I thought it was a doc line
kernel/sched/core.c:11505: warning: Cannot understand  * @use_cid_lock: Select cid allocation behavior: lock-free vs spinlock.
 on line 11505 - I thought it was a doc line

Fixes: 223baf9 ("sched: Fix performance regression introduced by mm_cid")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20230428031111.322-1-rdunlap@infradead.org

kernel/sched/core.c

@@ -11492,7 +11492,7 @@ void call_trace_sched_update_nr_running(struct rq *rq, int count)
 
 #ifdef CONFIG_SCHED_MM_CID
 
-/**
+/*
  * @cid_lock: Guarantee forward-progress of cid allocation.
  *
  * Concurrency ID allocation within a bitmap is mostly lock-free. The cid_lock
@@ -11501,7 +11501,7 @@ void call_trace_sched_update_nr_running(struct rq *rq, int count)
  */
 DEFINE_RAW_SPINLOCK(cid_lock);
 
-/**
+/*
  * @use_cid_lock: Select cid allocation behavior: lock-free vs spinlock.
  *
  * When @use_cid_lock is 0, the cid allocation is lock-free. When contention is