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Clarify syntactical difference in label function docs (#4957)

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crates/typst/src/foundations/label.rs
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@ -29,6 +29,16 @@ use crate::utils::PicoStr;
/// its name in angle brackets. This works both in markup and code. A label's
/// name can contain letters, numbers, `_`, `-`, `:`, and `.`.
///
/// Note that there is a syntactical difference when using the dedicated syntax
/// for this function. In the code below, the `[<a>]` terminates the heading and
/// thus attaches to the heading itself, whereas the `[#label("b")]` is part of
/// the heading and thus attaches to the heading's text.
///
/// ```typ
/// = Intro <a> // Equivalent to `#heading[Intro] <a>`.
/// = Concl #label("b") // Equivalent to `#heading[Concl #label("b")]`.
/// ```
///
/// Currently, labels can only be attached to elements in markup mode, not in
/// code mode. This might change in the future.
#[ty(scope, cast)]