docs: typography hygiene + 2 in-body H1 removals across 6 pages

Replaced 60 typography characters (curly quotes, apostrophes, em/en
dashes, non-breaking hyphens) with ASCII equivalents per
docs/CLAUDE.md heading and content hygiene rules.

- docs/start/openclaw.md: 10 chars; removed the duplicate '# Building
  a personal assistant with OpenClaw' H1 (Mintlify renders title from
  frontmatter).
- docs/platforms/mac/remote.md: 10 chars; removed the duplicate
  '# Remote OpenClaw (macOS ⇄ remote host)' H1 (the U+21C4 codepoint
  and parens both produced brittle anchors).
- docs/tools/thinking.md: 10 chars
- docs/reference/templates/BOOTSTRAP.md: 10 chars (kept the in-body
  '# BOOTSTRAP.md - Hello, World' heading because the page is a
  template whose content is meant to be copied verbatim into a
  workspace BOOTSTRAP.md).
- docs/plugins/sdk-provider-plugins.md: 10 chars
- docs/platforms/macos.md: 10 chars

docs/tools/thinking.md

@@ -9,11 +9,11 @@ title: "Thinking levels"
 
 - Inline directive in any inbound body: `/t <level>`, `/think:<level>`, or `/thinking <level>`.
 - Levels (aliases): `off | minimal | low | medium | high | xhigh | adaptive | max`
-  - minimal → “think”
-  - low → “think hard”
-  - medium → “think harder”
-  - high → “ultrathink” (max budget)
-  - xhigh → “ultrathink+” (GPT-5.2+ and Codex models, plus Anthropic Claude Opus 4.7 effort)
+  - minimal → "think"
+  - low → "think hard"
+  - medium → "think harder"
+  - high → "ultrathink" (max budget)
+  - xhigh → "ultrathink+" (GPT-5.2+ and Codex models, plus Anthropic Claude Opus 4.7 effort)
   - adaptive → provider-managed adaptive thinking (supported for Claude 4.6 on Anthropic/Bedrock, Anthropic Claude Opus 4.7, and Google Gemini dynamic thinking)
   - max → provider max reasoning (Anthropic Claude Opus 4.7; Ollama maps this to its highest native `think` effort)
   - `x-high`, `x_high`, `extra-high`, `extra high`, and `extra_high` map to `xhigh`.