docs(cli): update rolling rollout description

[cursor]

Summary

• update beta endpoint rollout CLI help to match the SDK rolling rollout description
• replace stale capacity-preserving wording in rollout examples

Tests

• python3 -m pytest tests/cli/test_beta_endpoints_rollout.py
• python3 -m ruff check src/together/lib/cli/api/beta/endpoints/rollout.py src/together/lib/cli/utils/_help_examples.py

  

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