scripts/spelling.txt: add more spelling corrections

Current Debian lintian tool flagged several (more) spelling errors, so
add them so they can hopefully be prevented in the future.

Link: https://lkml.kernel.org/r/20230122173256.52280-1-didi.debian@cknow.org


Signed-off-by: Diederik de Haas <didi.debian@cknow.org>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>