Ruby: Link to MaD docs from Ruby doc page

Also remove an internal link from the docs.

Author: hmac

docs/codeql/codeql-language-guides/codeql-for-ruby.rst

@@ -23,3 +23,5 @@ Experiment and learn how to write effective and efficient queries for CodeQL dat
 -  :doc:`Using API graphs in Ruby <using-api-graphs-in-ruby>`: API graphs are a uniform interface for referring to functions, classes, and methods defined in external libraries.
 
 -  :doc:`Abstract syntax tree classes for working with Ruby programs <abstract-syntax-tree-classes-for-working-with-ruby-programs>`: CodeQL has a large selection of classes for representing the abstract syntax tree of Ruby programs.
+
+-  :doc:`Customizing library models for Ruby <customizing-library-models-for-ruby>`: You can model frameworks and libraries that your codebase depends on using data extensions and publish them as CodeQL model packs.

docs/codeql/codeql-language-guides/customizing-library-models-for-ruby.rst

@@ -30,8 +30,6 @@ The CodeQL library for Ruby exposes the following extensible predicates:
 - **typeModel**\(type1, type2, path)
 - **summaryModel**\(type, path, input, output, kind)
 
-See the `CLI documentation for how to load and use data extensions in a CodeQL evaluation run <https://docs.google.com/document/d/14IYCHX8wWuU-HTvJ2gPSdXQKHKYbWCHQKOgn8oLaa80/edit#heading=h.m0v53lpi6w2n>`__ (internal access required).
-
 We'll explain how to use these using a few examples, and provide some reference material at the end of this article.
 
 Example: Taint sink in the 'tty-command' gem