card: retitle zero-value section, drop "placeholder" wording

#7
by rmems - opened

Renames the 'Empty slots and placeholder zeros' heading and its two anchor links to 'Empty slots and zero values'. The section already says fan_speed_pct is 97% zero and plausibly real. README only.

Co-authored-by: Grok grok@x.ai

Investigated by Grok Bot: HF Release Curator
Cited by: HF Release Curator (Grok Bot)

rmems changed pull request status to merged

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