docs: rename info tag protocol_versions -> protocol_version

[grunch]

What

Rename the kind-38385 info-event tag protocol_versions → protocol_version (singular) throughout the transport v2 spec.

Why

A client and a node are compatible only when they run the same protocol version, so the tag advertises a single value ("1" or "2"), never a list. The plural name was misleading.

Coordination

Targets the #48 branch (docs/transport-v2) so it folds into that PR. Matching code changes:

• mostrod (emitter): fix(nip33): rename info tag protocol_versions -> protocol_version mostro#782
• mostro-cli (reader): feat(transport): Phase 3 — auto-detection + get-dm v2 + docs mostro-cli#178

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