Revert #119515 single line where clause style guide This did not get implemented for the style edition in 2024, so this PR removes it from the documentation. See tracking issue https://github.com/rust-lang/rust/issues/132381. This can be added back in the next edition if it gets implemented. I'm a little unclear on what the style team intends for how future changes are documented. For example, the current style-guide documented behavior that rustfmt does not support. I'm not sure who the audience for this document is, or how this is intended to stay in sync with rustfmt. For example, if I read this and assume this is how it is supposed to work, and then rustfmt breaks that, it seems like that is confusing. Similarly, if I'm staying on an older edition, this documentation would be incorrect for my crate. Perhaps changes like this could be "teed-up" in a PR, but not merged until the edition is stabilized (similar to how the reference works)? And include notes for parts that are edition-specific (so if I am using an older edition, I can see that something is different). In general, I'm a little confused on how this is intended to work. Reverts: - https://github.com/rust-lang/rust/pull/119515
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