Stabilize Style Guide Entry for Precise Capture Syntax

[ytmimi]

Location

rust/src/doc/style-guide/src/nightly.md

Lines 9 to 19 in d9e5539

	### `feature(precise_capturing)`
	A `use<'a, T>` precise capturing bound is formatted as if it were a single path segment with non-turbofished angle-bracketed args, like a trait bound whose identifier is `use`.
	```
	fn foo() -> impl Sized + use<'a> {}
	// is formatted analogously to:
	fn foo() -> impl Sized + Use<'a> {}
	```

Summary

I believe that precise capturing (#123432) was stabilized, but it's still listed as a nightly-only feature in the style guide.

rust/src/doc/style-guide/src/nightly.md

Lines 9 to 19 in d9e5539

	### `feature(precise_capturing)`
	A `use<'a, T>` precise capturing bound is formatted as if it were a single path segment with non-turbofished angle-bracketed args, like a trait bound whose identifier is `use`.
	```
	fn foo() -> impl Sized + use<'a> {}
	// is formatted analogously to:
	fn foo() -> impl Sized + Use<'a> {}
	```

I think these docs should be moved to a stable section. Also, rust-lang/rustfmt#6504, was recently filed and I'm wondering if t-style had any recommendations for sorting the precise capture syntax in a list of bounds.

[xizheyin]

@rustbot claim