This test check hover on the 2nd argument in go:linkname directives.

Requires go1.19+ for the new go/doc/comment package.

-- flags --
-min_go=go1.19

-- go.mod --
module mod.com

-- upper/upper.go --
package upper

import (
	_ "unsafe"
	_ "mod.com/lower"
)

//go:linkname foo mod.com/lower.bar //@hover("mod.com/lower.bar", "mod.com/lower.bar", bar)
func foo() string

-- lower/lower.go --
package lower

// bar does foo.
func bar() string {
	return "foo by bar"
}

-- @bar --
```go
func bar() string
```

bar does foo.