Rollup merge of #30755 - datagrok:master, r=steveklabnik

I'm working my way through TRPL beginning at "Syntax and Semantics" as was recommended in a previous version.

I'm expecting the chapter to incrementally build up my knowledge of the language section by section, assuming no prior Rust experience. So it was a bit of a speed-bump to encounter references and the vector type in a code example long before they had been defined and explained.

Another commit in this PR tries to make consistent what is a "chapter" of TRPL versus a "section." Just a nit-pick, but not thinking about that stuff keeps my focus on the important material.

My background: Python programmer since ~2000, with moderate exposure to C, C++, assembly, operating systems, and system architecture in university several years ago.

For your kind consideration, feel welcome to use or drop or rework any part of this.

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