scripts/bloat-o-meter: fix typos in help

The bloat-o-meter script has two typos in the help, fix both.

Fixes: 192efb7a ("bloat-o-meter: provide 3 different arguments for data, function and All")
Signed-off-by: Matteo Croce <mcroce@redhat.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>