Docs: Check if done resolving first in authors example of dataviews

[Shelob9]

What?

• I got error, pasted below when trying this example.

normalize-fields.js:14 Uncaught TypeError: Cannot read properties of undefined (reading 'map')
    at normalizeFields (normalize-fields.js:14:1)
    at index.js:54:48
    at mountMemo (react-dom.js?ver=18.3.1:16416:21)
    at Object.useMemo (react-dom.js?ver=18.3.1:16861:18)
    at useMemo (react.js?ver=18.3.1:1640:23)
    at DataViews (index.js:54:26)
    at renderWithHooks (react-dom.js?ver=18.3.1:15496:20)
    at mountIndeterminateComponent (react-dom.js?ver=18.3.1:20113:15)
    at beginWork (react-dom.js?ver=18.3.1:21636:18)
    at HTMLUnknownElement.callCallback (react-dom.js?ver=18.3.1:4151:16)

• index.js:54 is const _fields = useMemo(() => normalizeFields(fields), [fields]); in @wordpress/dataviews/build-module/components/dataviews/index.js

Why?

• This fixed it by waiting until data has loaded

How?

• Update docs

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