doc: Fix Resolver example

[mapsi]

kind: UNIT was missing from the documentation and has cost me quite a bit of time to figure it out, so I should it'd add it. 🤓

[bboure]

Thanks!

[github-actions[bot]]

:tada: This PR is included in version 2.5.2 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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