Merge pull request #16073 from hmac/ruby-re-add-mad-docs

Ruby: Re-add MaD docs

Author: sidshank

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

@@ -13,6 +13,7 @@ Experiment and learn how to write effective and efficient queries for CodeQL dat
    abstract-syntax-tree-classes-for-working-with-ruby-programs
    analyzing-data-flow-in-ruby
    using-api-graphs-in-ruby
+   customizing-library-models-for-ruby
 
 -  :doc:`Basic query for Ruby code <basic-query-for-ruby-code>`: Learn to write and run a simple CodeQL query.
 
@@ -23,3 +24,5 @@ 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.