Name mismatch for the `_geo` field

[mdubus]

Description
The key used inside the hit for geolocation doesn't match the one returned by _highlightResult

Expected behavior
Both key should have matching names

Current behavior
The key inside the hit is called _geoloc while the one inside the _highlightResult is called _geo

Screenshots or Logs

Environment (please complete the following information):

• OS: MacOS
• Meilisearch version: v0.30.0rc4
• instant-meilisearch version: 0.9.0
• instantsearch.js version: 0.28.0

[bidoubiwa]

Fixed in #896