Fix formatting, spelling, and link issues in lesson files

[Copilot]

Overview

This PR addresses formatting inconsistencies, spelling issues, and broken links across the lesson files in the repository. The changes follow a consistent style using lessons/01-intro-to-genai/README.md as the reference for good structure and formatting.

Changes Made

Fixed header formatting issues

• Standardized main lesson titles to use Title Case (e.g., "Lesson 5: Talk to Your Data with RAG")
• Standardized section headers across all lessons (Related Resources, Self-Study Resources, Knowledge Check)
• Fixed title case in subheadings in the reference file and other lesson files
• Removed trailing colons from headers where they don't belong

Fixed British English spelling to American English

• Changed "colours" to "colors" in lessons/03-prompt-engineering/README.md
• Scanned for other common British spellings but found no other instances

Fixed broken links

• Fixed link in lessons/01-intro-to-genai/translations/README.zh-cn.md (corrected path to README.md for AI disclaimer)
• Fixed link in lessons/02-first-ai-app/translations/README.zh-cn.md (corrected path to lessons/01-intro-to-genai)
• Fixed link in lessons/03-prompt-engineering/translations/README.bn.md (updated sample app link)
• Fixed link in lessons/05-rag/translations/README.zh-cn.md (corrected path to lessons/01-intro-to-genai)
• Fixed image link in lessons/06-tool-calling/README.md (removed query parameter that was causing 404)

Fixed formatting in quiz files

• Removed trailing colons from question headers (e.g., "### ❓ Question 1:" → "### ❓ Question 1")
• Fixed formatting in solution quiz files for consistency

Testing

• Verified all links now resolve correctly
• Checked for consistent header formatting across lessons
• Verified American English spelling is used throughout

Fixes #121.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn.fwupd.org
  • Triggering command: /usr/bin/fwupdmgr refresh (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[softchris]

lgtm