docs(trail): keep NewClientWithBaseURL's comment on it; match the refusal wording

Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com Claude-Session: https://claude.ai/code/session_01XJeHKftfKHD7hSi6ZxJww8 Entire-Checkpoint: 01M6Q0B419ZR4ZQ3E72HV4742J