第六章代码中添加注释符以区分指令和注释

[kvii]

原书中 pdf 指令代码和注释文字颜色是不同的，很方便区分。译版的指令和文字是同色的，看的时候很难区分代码和注释。所以我
加了个注释符，不知道加对了没。

Summary by CodeRabbit

• Documentation
  • Enhanced PDF code examples with improved comment formatting for clearer readability and better presentation of operators.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 082d129e-ba4f-4fd5-bedf-31e3edf61255

📥 Commits

Reviewing files that changed from the base of the PR and between 76c8d04 and d7a35d9.

📒 Files selected for processing (1)

• chapter6.md

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📝 Walkthrough

Walkthrough

Chapter 6's "Hello, World！" PDF code example is reformatted with trailing % comments documenting each operator. The cm position operator, BT/ET text block delimiters, Tf font selection, and Tj text placement now carry inline comments describing their roles instead of separate descriptions.

Changes

PDF Example Formatting

Layer / File(s)	Summary
Hello World PDF example comment formatting chapter6.md	The "Hello, World！" PDF code sample operators are annotated with trailing % comments describing position-setting, text block markers, font selection, and text placement.

🎯 1 (Trivial) | ⏱️ ~2 minutes

A rabbit hops through the PDF page,
Adding comments, line by line,
Each operator now clear and sage, 🐰✨
The Hello World shines so fine!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding comment symbols to distinguish PDF/PostScript instructions from annotations in chapter 6.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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