style: prettier-format document-feature SKILL.md

Emphasis normalized to underscore; fixes red format:check.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.claude/skills/document-feature/SKILL.md

@@ -17,7 +17,7 @@ The repo splits docs by kind (`docs/README.md`). Pick one — don't write all th
   Shape: follow `docs/reference/roles-and-access.md` (H1 title, intro that links the
   governing ADR/WP, task-oriented `##` sections, `## See also` footer of backticked paths).
 - **ADR** — `docs/reference/architecture/NNNN-<slug>.md`. Only when you're recording a
-  *decision/pattern* (a tradeoff, a "we chose X over Y"). One format, no drift:
+  _decision/pattern_ (a tradeoff, a "we chose X over Y"). One format, no drift:
   `# ADR-NNNN — Title`, then `Status: Accepted · Date: YYYY-MM-DD`, then
   Problem / Options / Decision / Consequences.
 - **WP** — `docs/project/backlog/WP-NN-<slug>.md`. Tracked work; use the template at the