listx: docs: use GitHub permalinks in "Life of a Prow Job"

JobBuild
23089
07-31 16:44
pull-test-infra-bazel 1422986511363608576 1421512067340308480
pull-test-infra-integration 1422986511472660480 1421512067432583168
pull-test-infra-verify-file-perms 1422986511405551616 1421512067369668608
pull-test-infra-yamllint 1422986511430717440 1421512067407417344