spec/discovery.md: URL substitution example is wrong

[mcluseau]

spec/discovery.md says

The template for the discovery URL is:
https://{name}?ac-discovery=1

and

the effective equivalent of:
urltmpl="https://{name}-{version}-{os}-{arch}.{ext}"
curl $(echo "$urltmpl" | sed -e "s/{name}/$name/" -e "s/{version}/$version/" -e "s/{os}/$os/" -e "s/{arch}/$arch/" -e "s/{ext}/$ext/")

Since name=example.com/reduce-worker, the example result should be

Signature:  https://storage.example.com/linux/amd64/example.com/reduce-worker-1.0.0.aci.asc
ACI:        https://storage.example.com/linux/amd64/example.com/reduce-worker-1.0.0.aci

instead of

Signature:  https://storage.example.com/linux/amd64/reduce-worker-1.0.0.aci.asc
ACI:        https://storage.example.com/linux/amd64/reduce-worker-1.0.0.aci

This is at least what rkt does in my tests.

[jonboulle]

Good catch! I thought this had been noted a while ago but can't seem to find a reference. Would you mind putting up a PR to fix it?

[mcluseau]

looked weird to me too but, well, just happens :) I'll PR in a few minutes.

[mcluseau]

Here you are.