docs: update api/description/builtin-rules.md

[qudix]

• very small nit, as having never used clangd before I was confused as to why copying the example didn't work.

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[gemini-code-assist]

Summary of Changes

Hello @qudix, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the clarity and usability of the documentation for built-in rules, specifically focusing on the plugin.compile_commands.autoupdate rule. The changes aim to make it easier for users, especially those new to tools like clangd, to understand and correctly implement these rules by providing more explicit context and better-structured examples.

Highlights

• Documentation Clarity for plugin.compile_commands.autoupdate: The description for plugin.compile_commands.autoupdate has been enhanced to explicitly mention its use with language servers like clangd and to provide a clearer, separated example for setting a custom output directory.
• Concise Description for plugin.vsxmake.autoupdate: The introductory sentence for the plugin.vsxmake.autoupdate rule has been made more concise and direct.

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[gemini-code-assist]

Code Review

This is a great documentation improvement! Your changes make the purpose of plugin.vsxmake.autoupdate and plugin.compile_commands.autoupdate rules clearer and more direct. Splitting the example for plugin.compile_commands.autoupdate into a basic and an advanced case is particularly helpful for new users. I've added one small suggestion to make the example even more concise by removing a repeated code block.