5.x Update example for using `this` in custom cypher

[neo-technology-commit-status-publisher]

Thanks for the documentation updates.

The preview documentation has now been torn down - reopening this PR will republish it.

[mjfwebb]

is this for 5.x as well as 4.x?

https://github.com/neo4j/docs-graphql/pull/176 made for 4.x as it is a different file