docs: fix unclosed code block in multilingual tip blockquote

[Copilot]

The Multilingual Support section's tip blockquote opened a fenced code block (```bash) without a closing ```, breaking markdown rendering for everything that followed.

Changes

• Fixed incomplete code block — added closing > ``` inside the blockquote tip
• Added Multilingual Support section (§4) — usage examples, --lang flag docs, supported languages table (en/hi/es/fr/de/zh/ja/pt)
• Updated Quick Start — added --lang usage examples alongside existing --json examples
• Added Live Demo section — references assets/errlens-run.gif and assets/errlens-analyze.gif
• Removed duplicate --- separator that preceded the new section

The corrected tip block:

> 💡 **Tip:** Combine with `--json` for multilingual CI/CD pipeline output:
> ```bash
> errlens analyze "is not a function" --lang fr --json
> ```

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Fix incomplete code block formatting</issue_title>
<issue_description>> ⚠️ Potential issue | 🟡 Minor

Fix incomplete code block formatting.

The tip section at line 210-212 appears to have an incomplete code block. The opening triple backticks start a code block but there's no closing backticks shown, which will cause rendering issues.

🔧 Verify and fix the code block

Ensure the code block is properly closed:

 > 💡 **Tip:** Combine with `--json` for multilingual CI/CD pipeline output:
 > ```bash
 > errlens analyze "is not a function" --lang fr --json
+> ```

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

💡 **Tip:** Combine with `--json` for multilingual CI/CD pipeline output:

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@README.md` around lines 209 - 212, The README tip contains an unclosed code
fence for the bash example; locate the tip with the command snippet (errlens
analyze "is not a function" --lang fr --json) and add the missing closing triple
backticks to properly terminate the fenced code block so the markdown renders
correctly.

Originally posted by @coderabbitai[bot] in #61</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Fix incomplete code block formatting #62

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