Rollup merge of #30038 - Carreau:cargo-philosopher, r=steveklabnik

At this point of the book, reader have likely use `cargo new --bin`,
likely 2 times, once if they are lazy. This remind them of the `cargo`
syntax.

I was myself unsure whether it was `cargo create`, `cargo new`, and
whether it would initialize in current working directory or needed a
target.

--

Otherwise thanks, I've been writing rust for a few hours, and likes it so far.

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