docs: pstore-blk.rst: fix typo, s/console/ftrace

The author referred to the ftrace log, but mentioned console log
instead. Fix the typo.

Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Link: https://lore.kernel.org/r/20230914133729.1956907-2-tudor.ambarus@linaro.org


Signed-off-by: Kees Cook <keescook@chromium.org>