codespell reported typos

[vt-alt]

codespell reports typos:

$ codespell
./USAGE.md:26: specifid ==> specified
./src/cache.c:738: Flusing ==> Flushing
./src/link.c:626: manange ==> manage
./src/main.c:406: specifid ==> specified

Also

$ git grep licurl
USAGE.md:            --insecure-tls      Disable licurl TLS certificate verification by
src/main.c:        --insecure-tls      Disable licurl TLS certificate verification by\n\

[fangfufu]

Fixed via a898adf