taint: add reminder about updating docs and scripts

Sometimes people update taint-related pieces of the kernel without
updating the supporting documentation or scripts. Add a reminder to do
this.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Randy Dunlap <[e-mail]>
Suggested-by: Jason Gunthorpe <[e-mail]>
Reviewed-by: Jason Gunthorpe <[e-mail]>
Cc: David Gow <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

kernel/panic.c

···
 /*
  * TAINT_FORCED_RMMOD could be a per-module flag but the module
  * is being removed anyway.
+ *
+ * NOTE: if you modify the taint_flags or TAINT_FLAGS_COUNT,
+ * please also modify tools/debugging/kernel-chktaint and
+ * Documentation/admin-guide/tainted-kernels.rst, including its
+ * small shell script that prints the TAINT_FLAGS_COUNT bits of
+ * /proc/sys/kernel/tainted.
  */
 const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = {
 	TAINT_FLAG(PROPRIETARY_MODULE,		'P', 'G', true),