[#229] fix: correct stale skill counts in writing-skills.mdx after rebase

Found while rebasing this branch onto the updated main: this file's own
"Process 11 / Capability 22" counts predate #246's process→capability
reclassification and weren't part of the rebase conflict (git auto-merged
it verbatim since main never touched this specific file). Corrected to
Process 9 / Capability 24, consistent with skills-guide.md and
skills-catalog.mdx. Also fixed a pre-existing MD012 (multiple blank lines)
markdownlint violation at EOF.

Refs: #229

Author: rucka

apps/website/content/docs/contributing/writing-skills.mdx

@@ -11,8 +11,8 @@ This guide walks you through creating a new skill for the pair Knowledge Base.
 
 | Type | Count | Purpose |
 |------|-------|---------|
-| **Process** | 11 | Lifecycle phases — orchestrate capability skills (e.g., `/implement`, `/review`) |
-| **Capability** | 22 | Atomic units — perform a single focused operation (e.g., `/verify-quality`, `/record-decision`) |
+| **Process** | 9 | Lifecycle phases — orchestrate capability skills (e.g., `/implement`, `/review`) |
+| **Capability** | 24 | Atomic units — perform a single focused operation (e.g., `/verify-quality`, `/record-decision`) |
 
 Process skills **compose** capability skills. Capability skills are independently invocable.
 
@@ -179,4 +179,3 @@ Add your skill to `packages/knowledge-hub/dataset/.pair/knowledge/skills-guide.m
 - [Agent Skills specification](https://agentskills.io) — The open standard.
 - [Skills Catalog](/docs/reference/skills-catalog) — Full list of all 34 pair skills.
 - [Skills concept](/docs/concepts/skills) — How skills fit into the pair ecosystem.
-