[docs] point QEMU Linux quick start at qemu-nographic.sh

[shiptux]

Problem

The QEMU Linux quick start only ever mentions ./qemu.sh, and its file table omits the qemu-nographic scripts entirely.

qemu.sh passes -serial stdio without -nographic, so QEMU opens a GTK window for the emulated CLCD. On a headless machine or over SSH it stops at gtk initialization failed (reproduced by running it with DISPLAY unset), with nothing in the guide explaining what to do next — even though the BSP already ships qemu-nographic.sh for exactly this case, and the BSP README itself recommends it for servers.

Change

• Add both qemu-nographic scripts to the file table in chapter 4
• Document ./qemu-nographic.sh in section 5.2, right where the project is first run

[CLAassistant]

All committers have signed the CLA.

[github-actions]

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为确保代码符合 RT-Thread 的编码规范，请在你的仓库中执行以下步骤运行代码格式化工作流（如果格式化CI运行失败）。
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[github-actions]

📌 Code Review Assignment

🏷️ Tag: documentation

Reviewers: @CXSforHPU @GorrayLi @lianux-mm

Changed Files (Click to expand)

• documentation/2.quick-start/quick_start_qemu/quick_start_qemu_linux.md

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📊 Current Review Status (Last Updated: 2026-09-10 13:53 CST)

• ⌛ @CXSforHPU Pending Review
• ⌛ @GorrayLi Pending Review
• ⌛ @lianux-mm Pending Review

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