Documentation: kgdb: Correct parameter error

Module kgdb had been converted to debug_core since commit c433820
("Move kernel/kgdb.c to kernel/debug/debug_core.c") be added, so let's
correct the module parameter path.

Fixes: c433820 ("Move kernel/kgdb.c to kernel/debug/debug_core.c")
Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240925100742.1730576-1-changhuang.liang@starfivetech.com

Author: changhuangliang

Documentation/dev-tools/kgdb.rst

@@ -329,7 +329,7 @@ ways to activate this feature.
 
 2. Use sysfs before configuring an I/O driver::
 
-	echo 1 > /sys/module/kgdb/parameters/kgdb_use_con
+	echo 1 > /sys/module/debug_core/parameters/kgdb_use_con
 
 .. note::