docs: propose auto-approve conditions for docs PRs

.github/auto-approve/README.md

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+# Auto-approvable changes in ArcadeAI/docs
+
+## Why auto approve
+
+Docs are a low-risk surface area. The main priority of our documentation is to
+help our users and their agents understand how to operate Arcade in the way that
+meets their needs.
+
+## Proposed auto approve conditions
+
+### Low risk (auto-approvable)
+
+- Human-authored PRs under 300 lines with no new routes
+
+### Medium risk (human review: any team member)
+
+- Bot-authored PRs
+- Human-authored PRs introducing a new page or over 300 lines
+
+### Higher risk (human review: codeowner)
+
+- Modifications to the toolkit gen pipeline
+- Modifications to GitHub Actions
+- Modifications to `package.json`
+
+## As in other repositories
+
+- Merging remains a human action
+- Approving a PR means you co-sign its contents
+- If you aren't sure your change is accurate, tag a subject-matter expert for
+  review!