Describe the bug

As mentioned in #410 (comment), when using this plugin with an OpenAPI 3.1 schema that uses [string, null] as a list of valid types for a property, instead of showing the enum of types, it joins the array together with no spaces.

Expected behavior

Show a "nullable" tag for the property or just list the valid property types.

For example of the usage, see https://www.openapis.org/blog/2021/02/16/migrating-from-openapi-3-0-to-3-1-0 and "Swap nullable for type arrays"

Another example of this valid usage in OpenAPI 3.1: OAI/OpenAPI-Specification#3148

Current behavior

The list of valid property types are joined into a string with no spaces.

Possible solution

Steps to reproduce

1. Create an OpenAPI 3.1 schema that has a property with type [string, null]
2. Render API docs with the plugin

Screenshots

Context

Trying to keep up-to-date with the current OpenAPI schema while providing clear, useful, and accurate api docs to our users.

Your Environment

• Version used:
• Environment name and version (e.g. Chrome 59, node.js 5.4, python 3.7.3): Safari 17.6
• Operating System and version (desktop or mobile): macOS 14.6.1
• Link to your project: https://docs.defined.net/api/defined-networking-api/