cmd/go/internal/doc: pass URL fragments separately with -http
Plumb URL fragments separately when invoking pkgsite so the `#` doesn't
get %-encoded into the path.
Fixes: #75088
Change-Id: I33814fc6a192dff3e4f3d0b9d81205056dddd438
Reviewed-on: https://go-review.googlesource.com/c/go/+/697435 Reviewed-by: Sean Liao <sean@liao.dev> Reviewed-by: Ian Alexander <jitsu@google.com> Reviewed-by: Michael Matloob <matloob@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Matloob <matloob@golang.org>