Rollup merge of #83388 - alamb:alamb/fmt-dcs, r=Mark-Simulacrum
Make # pretty print format easier to discover # Rationale: I use (cargo cult?) three formats in rust: `{}`, debug `{:?}`, and pretty-print debug `{:#?}`. I discovered `{:#?}` in some blog post or guide when I started working in Rust. While `#` is documented I think it is hard to discover. So taking the good advice of ```@carols10cents``` I am trying to improve the docs with a PR As a reminder "pretty print" means that where `{:?}` will print something like ``` foo: { b1: 1, b2: 2} ``` `{:#?}` will prints something like ``` foo { b1: 1 b2: 3 } ``` # Changes Add an example to `fmt` to try and make it easier to discover `#`
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//! format!("{value}", value=4); // => "4"
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//! format!("{} {}", 1, 2); // => "1 2"
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//! format!("{:04}", 42); // => "0042" with leading zeros
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//! format!("{:#?}", (100, 200)); // => "(
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//! // 100,
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//! // 200,
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//! // )"
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//! ```
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//!
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//! From these, you can see that the first argument is a format string. It is
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//! * `-` - Currently not used
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//! * `#` - This flag indicates that the "alternate" form of printing should
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//! be used. The alternate forms are:
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//! * `#?` - pretty-print the [`Debug`] formatting
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//! * `#?` - pretty-print the [`Debug`] formatting (adds linebreaks and indentation)
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//! * `#x` - precedes the argument with a `0x`
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//! * `#X` - precedes the argument with a `0x`
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//! * `#b` - precedes the argument with a `0b`
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