runtime: remove zhangyunhao116/fastrand from cheaprand linkname comment

As of version 0.5.0 and Go 1.22 it no longer linknames cheaprand.

Fixes #67709

Change-Id: Ie00900e6428244fa1506bc509c265c10dc322f7a
Reviewed-on: https://go-review.googlesource.com/c/go/+/589555
Auto-Submit: Ian Lance Taylor <[email protected]>
Reviewed-by: Michael Knyszek <[email protected]>
Reviewed-by: Than McIntosh <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: ianlancetaylor

src/runtime/rand.go

@@ -182,7 +182,6 @@ func randn(n uint32) uint32 {
 // but widely used packages access it using linkname.
 // Notable members of the hall of shame include:
 //   - github.com/bytedance/gopkg
-//   - github.com/zhangyunhao116/fastrand
 //
 // Do not remove or change the type signature.
 // See go.dev/issue/67401.