Revise WIP-related code examples

Problem to solve

Several portions of https://docs.gitlab.com/ee/development/api_graphql_styleguide.html use examples that mention WIP, which we're trying to deprecate and remove from our documentation in #231502 (closed). Your technical writer (@aqualls) can't generate new examples for this page, so this work needs to be assigned to an engineer first.

Further details

This work may be considered a blocker for #231502 (closed) - we don't want to encourage users to try using these functions.

Proposal

Who can address the issue

An engineer from groupcode review.

Other links/references

Related to #231502 (closed)