standardize upstream version-check comments across roles

Reword and reposition the lookup comment above each upstream _version
var to a single greppable "# version-check: <url>" marker, matching the
convention adopted in ansible-roles: always directly above the version
line, one grep finds every instance.

Covers bitcoind, bitcoind-prometheus-exporter, lnd (lnd_version and
lndconnect_version, the latter had no lookup comment before), and
lnurld/build, which points at the upstream commits page since
lnurld_version pins a commit hash rather than a release tag.

Document the convention in the README.

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