runtime: use canonical wireguard-go repo for procyield() linkname usage

The source code quoted tailscale's development fork, which is only a
development fork. The canonical github url is actually
github.com/wireguard/wireguard-go, but that's really just a mirror of
git.zx2c4.com/wireguard-go, and in any case, the proper go package name
is golang.zx2c4.com/wireguard, so just use that.

Change-Id: Ifa63c1c538989b3fcebcf06d1c238469bc73724d
Reviewed-on: https://go-review.googlesource.com/c/go/+/616736
Auto-Submit: Jason Donenfeld <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Michael Knyszek <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: zx2c4

src/runtime/stubs.go

@@ -268,7 +268,7 @@ func reflectcall(stackArgsType *_type, fn, stackArgs unsafe.Pointer, stackArgsSi
 // Notable members of the hall of shame include:
 //   - github.com/sagernet/sing-tun
 //   - github.com/slackhq/nebula
-//   - github.com/tailscale/wireguard-go
+//   - golang.zx2c4.com/wireguard
 //
 // Do not remove or change the type signature.
 // See go.dev/issue/67401.