rtla: Documentation: fix email addresses

Correct lkml@vger to linux-kernel@vger.
Add linux-trace-devel since that is what is in the MAINTAINERS file.

Fixes: d40d48e ("rtla: Add Documentation")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/tools/rtla/common_appendix.rst

@@ -1,6 +1,7 @@
 REPORTING BUGS
 ==============
-Report bugs to <lkml@vger.kernel.org>
+Report bugs to <linux-kernel@vger.kernel.org>
+and <linux-trace-devel@vger.kernel.org>
 
 LICENSE
 =======