Missing DocC documentation for `@Reasync` function

[broken-circle]

If a function annotated with @Reasync has attached documentation, the documentation will appear in the macro expansion but not in the site built by DocC.

This is a compiler issue that affects all peer, member, preamble, and body macros.

Upstream issue: swiftlang/swift#88175
Pending fix: swiftlang/swift#88827

Workaround

Create a markdown file in the DocC archive for the generated peer overload, and DocC will correctly attach it to the symbol when building the site.

Reproduction

/// A function with documentation.
/// 
/// Documentation appears in the expansion, but not in the DocC site.
@Reasync
public func example() async
{
    let x = 1
    _ = x
}