doc/logging.md: correct kmsg claim — kmsg receives plain text, not ANSI

Only DIE writes to /dev/kmsg (in debug mode), and the kmsg output
uses the raw message without ANSI formatting.  ANSI is added only
to the /dev/console output path.

Signed-off-by: Thierry Laurion <insurgo@riseup.net>

Author: tlaurion

doc/logging.md

@@ -394,7 +394,9 @@ color is never the sole signal; text prefixes carry meaning independently):
 
 \* INPUT prints a newline after user input, not before.
 
-debug.log and /dev/kmsg preserve ANSI codes for terminal rendering with `less -R`.
+debug.log preserves ANSI codes for terminal rendering with `less -R`.
+/dev/kmsg always receives plain text (ANSI formatting is added only to the
+/dev/console output path).
 
 All console output goes to **`/dev/console`** — the kernel console device, which follows
 the `console=` kernel parameter and reaches whatever output the system was configured for