[docs] Remove a link to an outdated Go docs

[JohnTitor]

Summary

That link returns 404, we have bindings code on https://github.com/llvm/llvm-project/tree/main/llvm/bindings/go
but it seems we haven't published it and there are no docs yet.

[durin42]

Looks fine to me, but I have no idea what it would take to get the docs published there either. Maybe that's an easy fix?

[JohnTitor]

In D126874#3553894, @durin42 wrote:

Looks fine to me, but I have no idea what it would take to get the docs published there either. Maybe that's an easy fix?

AFAIK it isn't _easy_. To publish the doc, we have to add our package to pkg.go.dev, but the current repo structure doesn't fit to do it. See https://pkg.go.dev/about#adding-a-package for more details about adding a package.
I think it needs some governance decision (and some reworks) so for now, removing the link makes some sense here.

llvm/docs/Reference.rst

 -------------
 
 `Doxygen generated documentation <https://llvm.org/doxygen/>`_
   (`classes <https://llvm.org/doxygen/inherits.html>`_)
 
 :doc:`HowToUseAttributes`
   Answers some questions about the new Attributes infrastructure.
 
-`Documentation for Go bindings <http://godoc.org/llvm.org/llvm/bindings/go/llvm>`_
-
 LLVM Reference
 --------------
 
 ======================
 Command Line Utilities
 ======================
 
 :doc:`LLVM Command Guide <CommandGuide/index>`