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Rollup merge of #117740 - majaha:format_docs, r=joshtriplett

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Add some links and minor explanatory comments to `std::fmt`

I thought the documentation for the `#` flag could do with a link to the explanation of the `?xXbo` flags, because at that point they haven't been explained yet and it's a bit confusing.

I also added that the `0` flag overrides the fill character and alignment flag, here's a [Rust Playgrond](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=0d580b7b78b8a2d8c08a2fc7a936ef17) that shows what I mean.
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Matthias Krüger 2024-02-11 08:25:41 +01:00 committed by GitHub
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library/alloc/src/fmt.rs
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@ -188,6 +188,10 @@
//! * `#X` - precedes the argument with a `0x`
//! * `#b` - precedes the argument with a `0b`
//! * `#o` - precedes the argument with a `0o`
//!
//! See [Formatting traits](#formatting-traits) for a description of what the `?`, `x`, `X`,
//! `b`, and `o` flags do.
//!
//! * `0` - This is used to indicate for integer formats that the padding to `width` should
//! both be done with a `0` character as well as be sign-aware. A format
//! like `{:08}` would yield `00000001` for the integer `1`, while the
@ -197,6 +201,7 @@
//! and before the digits. When used together with the `#` flag, a similar
//! rule applies: padding zeros are inserted after the prefix but before
//! the digits. The prefix is included in the total width.
//! This flag overrides the [fill character and alignment flag](#fillalignment).
//!
//! ## Precision
//!