minor #1189 [Site] Use new BaseEntityAutocompleteType (smnandre)

This PR was squashed before being merged into the 2.x branch.

Discussion
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[Site] Use new BaseEntityAutocompleteType

Update the "Autocomplete" package page with the terrific new autocomplete type made by `@norkunas`

Commits
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0a2ed2a [Site] Use new BaseEntityAutocompleteType

Author: weaverryan