[PATCH] tracing: trace_mmap.h: fix a kernel-doc warning

Add a description of struct reader to resolve a kernel-doc warning:

Warning: include/uapi/linux/trace_mmap.h:43 struct member 'reader' not described in 'trace_buffer_meta'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
---
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: linux-trace-kernel@vger.kernel.org

 include/uapi/linux/trace_mmap.h |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20260126.orig/include/uapi/linux/trace_mmap.h
+++ linux-next-20260126/include/uapi/linux/trace_mmap.h

@@ -13,6 +13,7 @@
  * @reader.lost_events:	Number of events lost at the time of the reader swap.
  * @reader.id:		subbuf ID of the current reader. ID range [0 : @nr_subbufs - 1]
  * @reader.read:	Number of bytes read on the reader subbuf.
+ * @reader:		The reader composite info structure
  * @flags:		Placeholder for now, 0 until new features are supported.
  * @entries:		Number of entries in the ring-buffer.
  * @overrun:		Number of entries lost in the ring-buffer.