docs updates

[kenobijon]

Match the tighter upload cap: a key cannot land one model per lane. Also drop cloud-evaluated wording from the miner guides.

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Note

Low Risk
Mostly documentation; the kings URL change is a straightforward client rename and will fail only if the API is not deployed with the new path.

Overview
Miner docs now state the tighter discriminative rule: one counted model per hotkey (any single modality), with examples showing a single --image-model / --video-model / --audio-model per push and extra modalities on separate hotkeys. Multi-modality “push all three at once” examples are removed from README.md and docs/Discriminative-Mining.md.

Wording drops repeated “cloud-evaluated” / “cloud infrastructure” phrasing in README, Discriminative-Mining, Incentive, and Mining; evaluation is described more neutrally (upload for evaluation, isolated sandbox, no miner-hosted inference).

Validators fetch King-of-the-Hill state from /api/v1/validator/kings instead of current-kings (get_current_kings in gas/protocol/validator_requests.py, related log strings in neurons/validator/validator.py, docstring in gas/koth_weights.py). Response shape (kings, etc.) is unchanged on the client side.

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