Add examples to documentation

### Description

More examples will make this easier to use.

### Motivation

### Exemplification

### Benefits

### Possible Drawbacks

Start by locating the documentation for the Eiffel GraphQL API and reviewing its existing examples and usage flow. The issue names no documentation file, example scenario, or test, so first determine where examples belong and what gap they should address. Done means adding concrete, consistent examples that make the API easier to use and verifying the documentation renders correctly.

Written by the indexing model from the issue text.