ring-buffer: Fix a typo in function description

s/ring_buffer_commit_discard/ring_buffer_discard_commit/

Link: https://lkml.kernel.org/r/20201112151800.14382-1-hqjagain@gmail.com

Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

kernel/trace/ring_buffer.c

@@ -3645,7 +3645,7 @@ rb_decrement_entry(struct ring_buffer_per_cpu *cpu_buffer,
 }
 
 /**
- * ring_buffer_commit_discard - discard an event that has not been committed
+ * ring_buffer_discard_commit - discard an event that has not been committed
  * @buffer: the ring buffer
  * @event: non committed event to discard
  *