Code Generation doesn't generate Markdown

[sam-heilbron]

There is a portion of code generation that is responsible for docs generation: https://github.com/solo-io/solo-kit/tree/main/pkg/code-generator/docgen. This is a useful set of generated code, and an example of it is here: https://github.com/solo-io/gloo/blob/main/generate.go#L52.

However, when running:

make generated-code

locally, the generated docs are not modified.

#571 is an example of this. We updated template files, which have an impact on the generated markdown files. However, the PR is safe to merge because the docs are not generated by default.