sched_ext: fix stale references in doc comments

- inlines.h: scx_bpf_dispatch() doesn't exist; the comment means
  scx_bpf_sub_dispatch()
- internal.h: name %SCX_DEQ_SCHED_CHANGE instead of the never-defined
  %SCX_DEQ_SAVE
- internal.h: @name shows up in the ops file in the scheduler's sysfs
  directory, not a "kernel.sched_ext_ops" sysctl

Signed-off-by: Tao Cui <cuitao@kylinos.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/sched/ext/inlines.h

@@ -22,7 +22,7 @@ enum scx_dsp_verdict {
 };
 
 /*
- * One user of this function is scx_bpf_dispatch() which can be called
+ * One user of this function is scx_bpf_sub_dispatch() which can be called
  * recursively as sub-sched dispatches nest. Always inline to reduce stack usage
  * from the call frame.
  */

kernel/sched/ext/internal.h

@@ -485,7 +485,7 @@ struct sched_ext_ops {
 	 * - sleeping (%SCX_DEQ_SLEEP)
 	 * - being moved to another CPU
 	 * - being temporarily taken off the queue for an attribute change
-	 *   (%SCX_DEQ_SAVE)
+	 *   (%SCX_DEQ_SCHED_CHANGE)
 	 *
 	 * This and ->dequeue() are related but not coupled. This operation
 	 * notifies @p's state transition and may not be preceded by ->dequeue()
@@ -966,8 +966,9 @@ struct sched_ext_ops {
 	 * @name: BPF scheduler's name
 	 *
 	 * Must be a non-zero valid BPF object name including only isalnum(),
-	 * '_' and '.' chars. Shows up in kernel.sched_ext_ops sysctl while the
-	 * BPF scheduler is enabled.
+	 * '_' and '.' chars. Exposed via the ops file in the scheduler's sysfs
+	 * directory, /sys/kernel/sched_ext/root/ops for the root scheduler,
+	 * while the BPF scheduler is enabled.
 	 */
 	char name[SCX_OPS_NAME_LEN];