[TXyy2023]

Fixes #1956.

The DSL example uses stringify!{$e} without explaining why it has braces. Add a short note that the parenthesized and bracketed forms have the same effect here, and that calculate! accepts any of the three delimiter pairs regardless of its matcher. Also mention the trailing semicolon needed for parenthesized or bracketed statement invocations. The runnable example is unchanged.

Validation: mdbook test (197 chapters), the original example compiled and run, English/Japanese/Chinese/Spanish/Korean builds, and the official full-tree linkchecker for all five builds. Separately compiled three stringify! variants and six statement-delimiter/semicolon cases to verify the explanation against actual behavior, including the two expected syntax errors.

The wording follows the Rust Reference's macro invocation syntax and outer matcher delimiter rule.

AI assistance: Authored and validated with OpenAI Codex in a user-authorized contribution automation.

[rustbot]

Thanks for the pull request, and welcome! The Rust Project has assigned @marioidival (or someone else) to review your changes, you should hear from them (or someone else) within the next two weeks.

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• Owners of files modified in this PR: @marioidival

[Kivooeo]

sorry but i think having llm generated documentation is unacceptable, we had bad stories in past about it, and i would be glad if we don't repeat ours mistakes from past

[TXyy2023]

Understood. This PR was prepared with LLM assistance. I will not submit further automated documentation contributions to this repository.