* docs: style pass on assistant skills page
Align the assistant skills page (added in #6363) with docs style
standards: tighter intro without promotional language, language tag
on the directory tree code block, active voice, prose instead of a
behavior bullet list, and action-oriented headings.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>