scripts/spelling: add a few more typos

Add a few more typos that found from real patches[1,2] to 'spelling' file.

[1] https://lore.kernel.org/linux-mm/4bc4ab74-3ccd-f892-b387-d48451463d3c@huawei.com/
[2] https://lore.kernel.org/damon/20221228174621.34868-1-sj@kernel.org/

Link: https://lkml.kernel.org/r/20230104184017.1724-1-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Colin Ian King <colin.i.king@gmail.com>
Cc: Drew Fustini <dfustini@baylibre.com>
Cc: Joe Perches <joe@perches.com>
Cc: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

scripts/spelling.txt

@@ -664,11 +664,13 @@ feauture||feature
 feautures||features
 fetaure||feature
 fetaures||features
+fetcing||fetching
 fileystem||filesystem
 fimrware||firmware
 fimware||firmware
 firmare||firmware
 firmaware||firmware
+firtly||firstly
 firware||firmware
 firwmare||firmware
 finanize||finalize
@@ -1559,6 +1561,7 @@ tunning||tuning
 ture||true
 tyep||type
 udpate||update
+updtes||updates
 uesd||used
 unknwon||unknown
 uknown||unknown