Add intros to GraphQL pages

[ethanpalm]

What article on docs.github.com is affected?

• "Queries"
• "Interfaces"
• "Enums"
• "Mutations"

What part(s) of the article would you like to see updated?

Each of these articles needs an intro to help orient users to the content on the page and what each data type in the GraphQL API schema can be used for. Intros should be one sentence long and define what the feature is.

For "Interfaces" and "Enums" the first sentence in the "About" sections can be cut and pasted for the intros (but do not include any hyperlinks).

For "Mutations," the second sentence can be used for the intro.

For "Queries" you will need to write a new intro.

For more information about writing intros, see:

• Information about writing intros in the GitHub docs content model
• Information about the intro frontmatter property in the GitHub Docs content directory README

Additional information

This issue is for the Campus Experts + Docs program and not currently available for contributors outside the program to work on.