Adding Type Aliases to Documentation

Since we work a lot with custom type aliases, create a documentation page explaining custom type aliases used in the project. This could be added to either the API documentation or the general documentation section.

Review the project's existing API and general documentation sections, then identify the custom type aliases used in the codebase. Add a documentation page in the more appropriate section explaining those aliases, and confirm that the page is discoverable and accurately covers the aliases in use.

Written by the indexing model from the issue text.