[master < E-util-docs] Write docs for util module

[mpintaric55334]

Description

Please briefly explain the changes you made here.

This PR is for a documentation page of the util MAGE query module. The module contains a single function.

Pull request type

Please delete options that are not relevant and check the ones that are.

• [x] New documentation page

Related PRs and issues

PR this doc page is related to:

https://github.com/memgraph/mage/pull/311

Closes (link to issue):

Checklist:

• [x] I checked all content with Grammarly
• [x] I performed a self-review of my code
• [x] I made corresponding changes to the rest of the documentation
• [x] The build passes locally
• [x] My changes generate no new warnings or errors