typo fix in -h's -o modern note.
typo fix in -h's -o modern note.

from adamchainz on github.

gencer/memcached,elfchief/memcached,elfchief/memcached,rmccullagh/memcached,memcached/memcached,dormando/memcached,memcached/memcached,bpzhang/memcached,dormando/memcached,rmccullagh/memcached,guikcd/memcached,memcached/memcached,rmccullagh/memcached,rmccullagh/memcached,elfchief/memcached,bpzhang/memcached,guikcd/memcached,guikcd/memcached,bpzhang/memcached,dormando/memcached,guikcd/memcached,rmccullagh/memcached,dormando/memcached,gencer/memcached,guikcd/memcached,elfchief/memcached,memcached/memcached,gencer/memcached,gencer/memcached,elfchief/memcached,memcached/memcached,dormando/memcached,bpzhang/memcached,gencer/memcached